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25 Adorable Facts About Puppies

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Everyone loves puppies, we know. It's scientifically proven that they're heart-meltingly cute. But there's more to the little fur babies than just those adorable puppy eyes. In honor of National Puppy Day, here are 25 things everyone should know about these four-legged snuggle buddies.

1. THE WORD PUPPY HAS FRENCH ROOTS.

A dog with a red beret and a scarf.
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Etymologists think the term puppy may come from poupeé, a French word meaning doll or toy. The word puppy doesn't appear to have entered the English language until the late 16th century—before that, English-speakers called baby dogs whelps. William Shakespeare's King John, believed to be written in the 1590s, is one of the earliest known works to use the (super cute) term puppy-dog.

2. PUPPIES EVOLVED TO BE BLIND AND DEAF AT BIRTH.

A puppy with closed eyes burrows into a white towel.
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Puppies are functionally blind and deaf at birth. On day one, their eyes are firmly shut and their ear canals closed. Why? In brief, it’s part of an evolutionary trade-off. Since pregnancy can hurt a carnivore's ability to chase down food, dogs evolved to have short gestation periods. Brief pregnancies meant that canine mothers wouldn't need to take prolonged breaks from hunting. However, because dog embryos spend such a short time in the womb (only two months or so), puppies aren't born fully developed—and neither are their eyes or ears.

3. PUPPIES HAVE BABY TEETH, TOO.

A person brushes a collie's teeth.
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Like many newborn mammals, puppies are born completely toothless. At 2 to 4 weeks of age, a puppy's 28 baby teeth will start to come in. Around 12 to 16 weeks old, those baby teeth fall out, and by the time pups are 6 months old, they should be sporting a set of 42 adult teeth.

4. PUPPIES TAKE A LOT OF NAPS.

A puppy sleeps against a plush toy.
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Like children, puppies need a lot of sleep—up to 15 to 20 hours of it a day. The American Kennel Club strongly advises dog owners to resist the urge to disturb napping puppies, because sleep is critical for a young canine's developing brain, muscles, and immune system. Puppy owners should also establish a designated sleeping space on their pup's behalf so they can snooze undisturbed.

5. CERTAIN BREEDS ARE USUALLY BORN BY C-SECTION.

Three bulldog puppies
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Purebred dogs can exhibit some extreme bodily proportions, which doesn't always make for easy births. Breeds with atypically large heads are more likely to be born by C-section than those with smaller skulls. A 2010 survey of 22,005 individual dog litters in the UK found that terriers, bulldogs, and French bulldogs had Caesarian births more than 80 percent of the time. The other breeds with the highest rates of C-sections were Scottish terriers, miniature bull terriers, Dandie Dinmont terriers, mastiffs, German wirehaired pointers, Clumber spaniels, and Pekingeses, according to the study.

6. SOME BREEDS HAVE BIGGER LITTERS THAN OTHERS.

Brown labrador puppies nurse.
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As a general rule, smaller breeds tend to have smaller litters, while bigger dogs give birth to more puppies. The biggest litter on record was born to a Neapolitan mastiff that gave birth via Caesarian section to a batch of 24 puppies in Cambridgeshire, UK in 2004. In rare cases, very small dogs do give birth to relatively large litters, though. In 2011, a Chihuahua living in the English town of Carlisle gave birth to a whopping 10 puppies—twice as many as expected. Each weighed less than 2.5 ounces.

7. SOME PUPPIES ARE BORN GREEN.

A golden retriever puppy wrapped in a green and white towel
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Sometimes, a puppy in a light-colored litter can be born green. On two different occasions in 2017, in fact, British dogs made the news for giving birth to green-tinted puppies. In January, a 2-year-old chocolate lab in Lancashire, UK gave birth to a litter that included a mossy-green pup. Her owners named her FiFi, after Fiona, the green-skinned ogre from Shrek. Just a few months later, a golden retriever in the Scottish Highlands also gave birth to a puppy with a green coat, a male named Forest. How did the puppies end up looking like Marvin the Martian? In rare cases, the fur of a light-haired puppy can get stained by biliverdin, a green pigment found in dog placentas. It's not permanent, though. The green hue gradually disappears over the course of a few weeks.

8. PUPPIES DON'T FIND YOUR YAWNS CONTAGIOUS.

A puppy stands on a wooden walkway yawning.
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Ever notice that when somebody yawns, other people may follow suit? Contagious yawning, thought to be a sign of empathy, affects humans, baboons, chimps, and yes, dogs. But as research published in Animal Cognition suggests, young canines aren't susceptible to catching yawns from birth. In the 2012 study, Swedish researchers took a group of 35 dogs between 4 and 14 months old on closely monitored play dates, feigning yawns in front of each individual animal. Dogs that were less than 7 months old didn't react, yet many of the older dogs would respond with a yawn of their own. This pattern mirrors what happens with humans—children don't pick up the habit of contagious yawning until around age 4, when they start to develop social skills like empathy. These results suggest that dogs, too, may develop empathy over the course of their puppyhood.

9. PUPPIES LIKE "BABY TALK" MORE THAN THEIR PARENTS DO.

A woman holds up a puppy.
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Like humans, puppies seem to grow out of baby talk, recent research has found. As part of a 2017 study, 30 women were asked to look at assorted photographs of people and dogs and utter this pre-written line: "Hi! Hello cutie! Who's a good boy? Come here! Good boy! Yes! Come here sweetie pie! What a good boy!" To the surprise of no one, the human test subjects spoke in a higher register while looking at dog pictures, especially puppy photos. Afterward, the researchers played the recordings for 10 adult pooches and 10 puppies. Almost all of the pups started barking and running toward the speaker when they heard the baby-talk recordings. In contrast, the grown dogs pretty much ignored the recordings altogether.

10. DALMATIAN PUPPIES ARE BORN SPOT-LESS.

A mother Dalmatian and her puppy snuggle together.
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Beloved by firefighters, Disney fans, and George Washington, Dalmatians arguably have the most recognizable coat of any dog breed. Or at least, full-grown Dalmatians do. As puppies, they're born white and spot-less. The markings usually begin to show up after four weeks or so. (A small subset of Dalmatian puppies are born with one or two large black blotches, known as patches, but those markings aren't allowed in most competitive show rings.)

11. PUPPIES KNOW HOW TO MANIPULATE YOU WITH THEIR EYES.

A dog sits on a chair and rests its chin on a table.
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Those adorable "puppy eyes" aren't an inadvertent expression of canine emotion; they're a deliberate ploy to get our attention. Puppies (and their older kin) have learned that raising their eyebrows, which makes their eyes appear bigger and sadder, makes them magnets for human attention. According to one study from 2017, dogs are more likely to make dramatic facial expressions like puppy-dog eyes when they know humans are watching. And it works. Research has shown that shelter puppies who put on such faces get adopted more quickly than dogs that show other behaviors, like wagging their tails.

12. PUPPIES CAN HAVE IDENTICAL TWINS.

Two identical puppies and their mother sit in the grass.

Scientists don't know how common identical twin puppies are, because until very recently, no one was able to prove that they existed at all. In 2016, Kurt de Cramer, a South African veterinarian, noticed something unusual while performing a C-section on a pregnant Irish wolfhound. Normally, every puppy gets its own placenta, yet de Cramer noticed that two of the seven pups in this litter shared a single placenta. Testing later verified that the puppies were genetically identical. It was the first confirmed case of identical twin puppies in the world.

13. SCIENTISTS HAVE SUCCESSFULLY CLONED (AND RE-CLONED) THEM.

Three puppies sit on a cushion.
Kim et al., Scientific Reports (2017)

In 1996, Dolly the sheep became the first successful mammal clone. Nine years later, geneticists in South Korea used the same process to engineer the world's first canine clone, an Afghan hound named Snuppy. While Snuppy passed away in 2015 at the respectable age of 10, his story isn't over yet. Last November, researchers announced that four puppies had been cloned from his stem cells. Sadly, one of the pups died a few days after its birth, but the other three survived. Scientists hope that these young dogs will teach us how healthy cloned animals are compared to their naturally conceived counterparts.

14. HAMILTON INCLUDES A SONG INSPIRED BY LIN-MANUEL MIRANDA'S PUPPY.

Lin Manuel Miranda
Justin Sullivan, Getty Images

In the award-winning musical Hamilton, Aaron Burr and Alexander Hamilton sing a ballad called "Dear Theodosia" to their newborn children. The tender song's inspiration wasn't a newborn babe, though. Lin-Manuel Miranda wrote it the week he adopted Tobillo, a stray puppy he and his wife found while on vacation in 2011.

15. A PUPPY DESTROYED HALF OF STEINBECK'S OF MICE AND MEN MANUSCRIPT.

A black-and-white portrait of John Steinbeck
Hulton Archive/Getty Images

Of Mice and Men might feature one of the biggest animal lovers in American literature—the rabbit- and puppy-loving Lennie—but ironically, a puppy once jeopardized the novel's existence. In May 1936, John Steinbeck's Irish setter, Toby, was going through his teething phase. Left alone one night, he demolished half of his master's manuscript for Of Mice and Men, eating through two months of work. And get this—Steinbeck didn't have any backup copies. But the author found it hard to stay angry with the puppy. "I was pretty mad, but the poor little fellow may have been acting critically," he wrote. "I didn't want to ruin a good dog for a manuscript I'm not sure is good at all." He just buckled down and rewrote the shredded chapters.

16. KEITH RICHARDS ONCE SMUGGLED A PUPPY THROUGH BRITISH CUSTOMS.

A 1967 photo of the Rolling Stones strolling through a park in London
Roger Jackson, Central Press/Getty Images

While the Rolling Stones were on tour in the U.S. in 1964, a fan gave guitarist Keith Richards a collie puppy named Ratbag. When Richards returned to the UK, rather than subject the pup to quarantine, he smuggled the animal through British customs under his coat. The dog would become one of Richards's most beloved companions, and a biographer would later write that the star "appeared to identify [with Ratbag] more than anybody else."

17. BARACK OBAMA'S PUPPY HAS HIS OWN BASEBALL CARD.

Bo Obama sits on the White House lawn.
Obama White House, Flickr // Public Domain

In April 2009, the Obamas adopted Bo, a 6-month-old Portuguese water dog. That summer, the White House put together an official baseball card loaded with fun facts about America's First Pooch. (For one: He can't swim.) You can still download the collectible card online.

18. THE SOVIET UNION ONCE GAVE JFK A VERY SPECIAL PUPPY.

Dogs can bring out the best in people, including political adversaries. While seated next to each other at a state dinner in Vienna in the early 1960s, First Lady Jackie Kennedy and Soviet Premier Nikita Khrushchev got to chatting about Strelka, the world-famous dog who had recently been sent into low-Earth orbit by the Soviet space program. Afterward, Khrushchev sent the Kennedys one of Strelka's newly born daughters. The puppy's name was Pushinka, which means fluffy in Russian.

19. A BOSTON MUSEUM HAS ENLISTED A PUPPY TO FIND ART-DESTROYING PESTS.

A Weimaraner puppy stands in an office at the Museum of Fine Arts, Boston.
Museum of Fine Arts, Boston

Boston's Museum of Fine Arts is currently training a Weimaraner pup named Riley to find unwanted pests that, if left unchecked, could harm priceless masterpieces. Riley is being taught to sniff out art-threatening insects like textile-eating moths and wood-boring beetles. "Pests are an ongoing concern for museums," deputy director Katie Getchell told The Boston Globe in January 2018. "It's exciting to think about this as a new way to address the problem." If Riley is able to do his job well, she said, other museums and archives that collect infestation-prone materials might be able to use trained dogs as a defense against bugs, too.

20. IBM'S WATSON IS JUDGING PUPPIES NOW.

Guide dog puppies in training are led by their trainers.
Erik S. Lesser, Getty Images

Not all puppies have what it takes to become guide dogs. Guide dogs have to be healthy, confident, hardworking, and not easily distracted. At the end of the day, many pups just aren't cut out for this line of work—at Guiding Eyes for the Blind, a nonprofit that trains and places seeing eye dogs in New York, only about 36 percent of trainee dogs make it. That's where Watson, the IBM supercomputer famous for winning Jeopardy, comes in. IBM has developed a new program for Watson that helps it predict how likely individual puppies are to graduate from Guiding Eyes's training school using data on the temperament, medical history, and genetics of the dogs as well as the personality traits of their trainers. The organization expects to improve its guide-puppy graduation rate by 20 percent using Watson's computing power.

21. LOOKING AT PUPPIES CAN MAKE YOU MORE PRODUCTIVE.

A poodle puppy sits on a desk next to a man working on a laptop.
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That puppy portrait hanging in your cubicle at work might be a bigger asset than you realized. For a 2012 Hiroshima University experiment on productivity, participants were asked to look at pictures from one of three categories: tasty food snapshots, pictures of adult animals, or photos of puppies and kittens. Then, they were asked to play a board game that required lots of precision. As it turned out, people who'd just seen puppies and kittens had an easier time concentrating on the task at hand than study subjects who saw other types of images.

22. OUR STONE-AGE ANCESTORS TOOK GOOD CARE OF THEIR PUPPIES.

A canine jawbone
Janssens et al., Journal of Archaeological Science (2018)

In 1914, archaeologists in Germany discovered the fossilized jawbone of a puppy that lived 14,000 years ago. According to a 2018 study on the specimen, the jaw probably belonged to a 27- or 28-week-old pup—and a sick one, at that. The teeth showed signs of canine distemper virus, a life-threatening disease that still has no cure. Analysis of the bone suggested that the animal first came down with the sickness at 19 weeks old. "Without adequate care," study co-author Luc Janssens noted in a press release, "a dog with a serious case of distemper will die in less than three weeks," yet this pup survived for another eight weeks. Even though the puppy wouldn't have been very useful to its prehistoric human owners, they kept it clean, warm, and well-fed for months, helping it survive for longer than it otherwise would have.

23. THERE'S A 17-TON PUPPY SCULPTURE IN BILBAO, SPAIN.

'Puppy' stands outside the Guggenheim Museum Bilbao.
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Since it opened in 1997, the Guggenheim Museum in Bilbao has been home to Puppy, a towering, flower-covered sculpture that artist Jeff Koons modeled after a young West Highland terrier. The 17-ton pooch owes its shape to a fabric-covered mesh that is topped with 37,000 live flowers. The 40-foot-tall, puppy-shaped garden is now regarded as a mascot for both the museum and the city itself.

24. THEY'RE NOT RUNNING AROUND THE PUPPY BOWL LIVE. (SORRY.)

A puppy plays with a toy at the Puppy Bowl.
Animal Planet

The fur-rocious Super Bowl spoof known as the Puppy Bowl made its debut on Animal Planet back in 2005. Viewers might be surprised to find out that, unlike the real game, the Puppy Bowl isn't broadcast live. Instead, the contest is shot over the course of an entire week. The crew spends two days filming the dogs with the help of 100 or more canine wranglers. Afterward, they dedicate three more days shooting things like sponsored products and cheerleader cats. Once production finally wraps, the editing process takes three full months.

25. HOLLYWOOD'S MOST ICONIC DOG WAS A TROUBLESOME PUPPY.

Lassie
Hulton Archive/Getty Images

The first dog to play Lassie on film was really a "laddie." Specifically, he was a male Rough collie named Pal. As a pup, the dog had some behavior issues—little Pal was overly enthusiastic and drove his first owner crazy with nonstop barking. (Even more disconcerting was the puppy's habit of chasing down motorcycles, a pastime he never outgrew.) After animal trainer Henry Peck failed to make any progress with Pal, he referred the puppy's owner to a colleague by the name of Rudd Weatherwax, who was much more successful at training him. Pal's original owner eventually gave him to Weatherwax, and the rest is history. Under the trainer's guidance, Pal starred in seven Lassie movies, plus two episodes of the spinoff TV series. Decades after his passing, The Saturday Evening Post declared that Pal had enjoyed "the most spectacular canine career in film history."

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Stones, Bones, and Wrecks
Humans Might Have Practiced Brain Surgery on Cows 5000 Years Ago
Scientific Reports, Fernando Ramirez Rozzi
Scientific Reports, Fernando Ramirez Rozzi

In the 1970s, archaeologists discovered a site in France containing hundreds of cow skeletons dating back 5000 to 5400 years. The sheer number wasn't surprising—human agriculture in that part of the world was booming by 3000 BCE. What perplexed scientists was something uncovered there a few decades later: a cow skull bearing a thoughtfully drilled hole. Now, a team of researchers has released evidence that suggests the hole is an early example of animal brain surgery.

Fernando Ramírez Rozzi, a paleontologist with the French National Center for Scientific Research, and Alain Froment, an anthropologist at the Museum of Mankind in Paris, published their findings in the journal Nature Scientific Reports. After comparing the opening to the holes chiseled into the skulls of humans from the same era, they found the bones bore some striking similarities. They didn't show any signs of fracturing from blunt force trauma; rather, the hole in the cow skull, like those in the human skulls, seemed to have been carved out carefully using a tool made for exactly that purpose. That suggests that the hole is evidence of the earliest known veterinary surgery performed by humans.

Trepanation, or the practice of boring holes into human skulls, is one of the oldest forms of surgery. Experts are still unsure why ancient humans did this, but the level of care that went into the procedures suggests that the surgery was likely used to treat sick patients while they were still alive. Why a person would perform this same surgery on a cow, however, is harder to explain.

The authors present a few theories, the first being that these ancient brain surgeons were treating a sick cow the same way they might treat a sick human. If a cow was suffering from a neural disease like epilepsy, perhaps they though that cutting a hole in its head would relieve whatever was agitating the brain. The cow would have needed to be pretty special to warrant such an effort when there were hundreds of healthy cows living on the same plot of land, as evidenced by the skeletons it was found with.

Another possible explanation was that whoever operated on the cow did so as practice to prepare them for drilling into the heads of live humans one day. "Cranial surgery requires great manual dexterity and a complete knowledge of the anatomy of the brain and vessel distribution," the authors write in the study. "It is possible that the mastery of techniques in cranial surgery shown in the Mesolithic and Neolithic periods was acquired through experimentation on animals."

Either way, the bovine patient didn't live to see the results of the procedure: The bone around the hole hadn't healed at all, which suggests the cow either died during surgery or wasn't alive to begin with.

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Animals
15 Incredible Facts About Pigeons
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Though they're often described as "rats with wings" (a phrase popularized by the movie Stardust Memories), pigeons are actually pretty cool. From homing instincts to misleading rump feathers, here are 15 things you might not know about these avian adventurers.

1. THEY MIGHT BE THE FIRST DOMESTICATED BIRD.

The common city pigeon (Columba livia), also known as the rock pigeon, might be the first bird humankind ever domesticated. You can see them in art dating back as far as 4500 BCE in modern Iraq, and they've been a valuable source of food for thousands of years.

2. THEY WON OVER CHARLES DARWIN—AND NIKOLA TESLA.

Pigeon-breeding was a common hobby in Victorian England for everyone from well-off businessmen to average Joes, leading to some fantastically weird birds. Few hobbyists had more enthusiasm for the breeding process than Charles Darwin, who owned a diverse flock, joined London pigeon clubs, and hobnobbed with famous breeders. Darwin's passion for the birds influenced his 1868 book The Variation of Animals and Plants Under Domestication, which has not one but two chapters about pigeons (dogs and cats share a single chapter).

Nikola Tesla was another great mind who enjoyed pigeons. He used to care for injured wild pigeons in his New York City hotel room. Hands down, Tesla's favorite was a white female—about whom he once said, "I loved that pigeon, I loved her as a man loves a woman and she loved me. When she was ill, I knew and understood; she came to my room and I stayed beside her for days. I nursed her back to health. That pigeon was the joy of my life. If she needed me, nothing else mattered. As long as I had her, there was a purpose in my life." Reportedly, he was inconsolable after she died.

3. THEY UNDERSTAND SPACE AND TIME.

In a 2017 Current Biology study, researchers showed captive pigeons a series of digital lines on a computer screen for either two or eight seconds. Some lines were short, measuring about 2.3 inches across; others were four times longer. The pigeons were trained to evaluate either the length of the line or how long it was displayed. They found that the more time a line was displayed, the longer in length the pigeon judged it to be. The reverse was true too: If the pigeons encountered a longer line, they thought it existed in time for a greater duration. Pigeons, the scientists concluded, understand the concepts of both time and space; the researchers noted "similar results have been found with humans and other primates."

It's thought that humans process those concepts with a brain region called the parietal cortex; pigeon brains lack that cortex, so they must have a different way of judging space and time.

4. THEY CAN FIND THEIR WAY BACK TO THE NEST FROM 1300 MILES AWAY.

A pigeon flying in front of trees.
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The birds can do this even if they've been transported in isolation—with no visual, olfactory, or magnetic clues—while scientists rotate their cages so they don't know what direction they're traveling in. How they do this is a mystery, but people have been exploiting the pigeon's navigational skills since at least 3000 BCE, when ancient peoples would set caged pigeons free and follow them to nearby land.

Their navigational skills also make pigeons great long-distance messengers. Sports fans in ancient Greece are said to have used trained pigeons to carry the results of the Ancient Olympics. Further east, Genghis Khan stayed in touch with his allies and enemies alike through a pigeon-based postal network.

5. THEY SAVED THOUSANDS OF HUMAN LIVES DURING WORLD WARS I AND II.

Pigeons' homing talents continued to shape history during the 20th century. In both World Wars, rival nations had huge flocks of pigeon messengers. (America alone had 200,000 at its disposal in WWII.) By delivering critical updates, the avians saved thousands of human lives. One racing bird named Cher Ami completed a mission that led to the rescue of 194 stranded U.S. soldiers on October 4, 1918.

6. TWO PIGEONS ALMOST DISTRACTED FROM THE DISCOVERY OF EVIDENCE OF THE BIG BANG.

In 1964, scientists in Holmdel, New Jersey, heard hissing noises from their antenna that would later prove to be signals from the Big Bang. But when they first heard the sound, they thought it might be, among other things, the poop of two pigeons that were living in the antenna. "We took the pigeons, put them in a box, and mailed them as far away as we could in the company mail to a guy who fancied pigeons," one of the scientists later recalled. "He looked at them and said these are junk pigeons and let them go and before long they were right back." But the scientists were able to clean out the antenna and determine that they had not been the cause of the noise. The trap used to catch the birds (before they had to later be, uh, permanently removed) is on view at the Smithsonian Air & Space Museum.

7. YOU CAN TRAIN THEM TO BE ART SNOBS …

Japanese psychologist Shigeru Watanabe and two colleagues earned an Ig Nobel Prize in 1995 for training pigeons, in a lab setting, to recognize the paintings of Claude Monet and Pablo Picasso and to distinguish between the painters. The pigeons were even able to use their knowledge of impressionism and cubism to identify paintings of other artists in those movements. Later, Watanabe taught other pigeons to distinguish watercolor images from pastels. And in a 2009 experiment, captive pigeons he'd borrowed were shown almost two dozen paintings made by students at a Tokyo elementary school, and were taught which ones were considered "good" and which ones were considered "bad." He then presented them with 10 new paintings and the avian critics managed to correctly guess which ones had earned bad grades from the school's teacher and a panel of adults. Watanabe's findings indicate that wild pigeons naturally categorize things on the basis of color, texture, and general appearance.

8. … AND TO DISTINGUISH WRITTEN WORDS.

In a 2016 study, scientists showed that pigeons can differentiate between strings of letters and actual words. Four of the birds built up a vocabulary of between 26 and 58 written English words, and though the birds couldn't actually read them, they could identify visual patterns and therefore tell them apart. The birds could even identify words they hadn't seen before.

9. FLUFFY PIGEON FEET MIGHT ACTUALLY BE PARTIAL WINGS.

A white pigeon with curly feathers and fluffy feet.
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A few pigeon breeds have fuzzy legs—which hobbyists call "muffs"—rather than scaly ones. According to a 2016 study, the DNA of these fluffy-footed pigeons leads their hind legs to take on some forelimb characteristics, making muffed pigeon legs look distinctly wing-like; they're also big-boned. Not only do they have feathers, but the hindlimbs are somewhat big-boned, too. According to biologist Mike Shapiro, who led the study, "pigeons' fancy feathered feet are partially wings."

10. SOME PIGEONS DISTRACT FALCONS WITH WHITE RUMP FEATHERS.

In a life-or-death situation, a pigeon's survival could depend upon its color pattern: Research has shown that wild falcons rarely go after pigeons that have a white patch of feathers just above the tail, and when the predators do target these birds, the attacks are rarely successful.

To figure out why this is, Ph.D. student Alberto Palleroni and a team tagged 5235 pigeons in the vicinity of Davis, California. Then, they monitored 1485 falcon-on-pigeon attacks over a seven-year span. The researchers found that although white-rumped pigeons comprised 20 to 25 percent of the area's pigeon population, they represented less than 2 percent of all the observed pigeons that were killed by falcons; the vast majority of the victims had blue rumps. Palleroni and his team rounded up 756 white- and blue-rumped pigeons and swapped their rump feathers by clipping and pasting white feathers on blue rumps, and vice versa. The falcons had a much easier time spotting and catching the newly blue-rumped pigeons, while the pigeons that received the white feathers saw predation rates plummet.

Close observation revealed that the white patches distract birds of prey. In the wild, falcons dive-bomb other winged animals from above at high speeds. Some pigeons respond by rolling away in midair, and on a spiraling bird, white rump feathers can be eye-catching, which means that a patch of them may divert a hungry raptor's focus long enough to make the carnivore miscalculate and zip right past its intended victim.

11. DODOS WERE RELATED TO TODAY'S PIGEONS.

Two blue and green Nicobar pigeons.
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Though most of this list focuses on the rock pigeon, there are 308 living species of pigeons and doves. Together, they make up an order of birds known as the columbiformes. The extinct dodo belonged to this group as well.

Flightless and (somewhat) docile, dodos once inhabited Mauritius, an island near Madagascar. The species had no natural predators, but when human sailors arrived with rats, dogs, cats, and pigs, it began to die out, and before the 17th century came to a close, the dodo had vanished altogether. DNA testing has confirmed that pigeons are closely related to the dodo, and the vibrant Nicobar pigeon (above) is its nearest genetic relative. A multi-colored bird with iridescent feathers, this near-threatened creature is found on small islands in the South Pacific and off Asia. Unlike the dodo, it can fly.

12. AT ONE POINT, MORE THAN ONE-QUARTER OF ALL THE BIRDS LIVING IN THE U.S. MAY HAVE BEEN PASSENGER PIGEONS.

Wild/feral rock pigeons reside in all 50 states, which makes it easy to forget that they're invasive birds. Originally native to Eurasia and northern Africa, the species was (most likely) introduced to North America by French settlers in 1606. At the time, a different kind of columbiform—this one indigenous—was already thriving there: the passenger pigeon (Ectopistes migratorius). As many as 5 billion of them were living in America when England, Spain, and France first started colonizing, and they may have once represented anywhere from 25 to 40 percent of the total U.S. bird population. But by the early 20th century, they had become a rare sight, thanks to overhunting, habitat loss, and a possible genetic diversity issue. The last known passenger pigeon—a captive female named Martha—died on September 1, 1914.

13. THEY'RE REALLY GOOD AT MULTITASKING.

According to one study, they're more efficient multitaskers than people are. Scientists at Ruhr-Universitat Bochum put together a test group of 15 humans and 12 pigeons and trained all of them to complete two simple jobs (like pressing a keyboard once a light bulb came on). They were also put in situations wherein they'd need to stop working on one job and switch over to another. In some trials, the participants had to make the change immediately. During these test runs, humans and pigeons switched between jobs at the same speed.

But in other trials, the test subjects were allowed to complete one assignment and then had to wait 300 milliseconds before moving on to the next job. Interestingly, in these runs, the pigeons were quicker to get started on that second task after the period ended. In the avian brain, nerve cells are more densely packed, which might enable our feathered friends to process information faster than we can under the right circumstances.

14. PIGEONS PRODUCE FAKE "MILK."

Only mammals produce genuine milk, but pigeons and doves (along with some other species of birds) feed their young with something similar—a whitish liquid filled with nutrients, fats, antioxidants, and healthy proteins called "crop milk." Both male and female pigeons create the milk in the crop, a section of the esophagus designed to store food temporarily. As is the case with mammal milk, the creation of crop milk is regulated by the hormone prolactin. Newly-hatched pigeons drink crop milk until they're weaned off it after four weeks or so. (And if you've ever asked yourself, "Where are all the baby pigeons?" we have the answer for you right here.)

15. ONE STUDY SUGGESTS THAT, GIVEN THE RIGHT CONDITIONS, THEY'RE AS GOOD AT IDENTIFYING CANCER AS DOCTORS.

We've already established that pigeons are excellent at differentiating between artists and words, but a 2015 study revealed they can also distinguish between malignant and benign growths in the right conditions. Researchers at University of California Davis Medical Center put 16 pigeons in a room with magnified biopsies of potential breast cancers. If the pigeons correctly identified them as either benign or malignant, they got a treat, According to Scientific American.

"Once trained, the pigeons' average diagnostic accuracy reached an impressive 85 percent. But when a "flock sourcing" approach was taken, in which the most common answer among all subjects was used, group accuracy climbed to a staggering 99 percent, or what would be expected from a pathologist. The pigeons were also able to apply their knowledge to novel images, showing the findings weren't simply a result of rote memorization."

Mammograms proved to be more of a challenge, however; the birds could memorize signs of cancer in the images they were trained on but could not identify the signs in new images.

No matter how impressive their results, "I don't anticipate that pigeons, no matter how good they become at pathology or radiology, will be playing a role in actual patient care—certainly for the foreseeable future," study co-author Richard M. Levenson told Scientific American. "There are just too many regulatory barriers—at least in the West."

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