Guard llamas are a real thing and they can tear an animal apart with their teeth and sharp nails. They are used to protect farm animals from coyotes and foxes. Most llamas also have an innate dislike for canines and will chase and attack such intruders with "extreme prejudice".
2. Wild mice (and many other wild animals) will run on an exercise wheel, even when not in a cage, just because they like it.
3. Four-legged animals like horses and dogs don't have backward knees. Those joints are actually their ankles, which bend in the same direction as our ankles do.
4. The Iron Snail lives in the Indian Ocean more than 2,500 meters deep. It is the only known gastropod with a suit of scale armor. The scales and the shell are mineralized with iron sulfide, essentially making a skeleton out of iron. It is the only animal so far known to do so.
5. Chipmunks and other small rodents have fast reaction time because they process light faster. They see the world in slow motion.
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The panda's gut isn't suited to digesting bamboo and can only digest 17% of the bamboo it eats. Instead, it is more suited to eating meat, like other species of bears.
7. Reindeers have many adaptations to survive in the cold. Their hooves expand in summer when the ground is soft and shrink in winter when the ground is hard. Some subspecies have knees that make a clicking noise when they walk so that the animals can stay together in a blizzard.
8. Grape-Kun was a Humboldt penguin that lived in a zoo in Japan. He grew so attached to a cardboard cutout of an anime girl that he lived with it as his ‘waifu’ till his death.
9. The sleepiest animal in the world is the koala, which sleeps 22 hours a day. The second is the sloth (20 hours), armadillo and opossum (tied at 19 hours each), lemur (16 hours), then hamster and squirrel (tied at 14 hours each).
10. Trichoplax is an animal with just a few thousand cells. It can regenerate from very small group of cells, and if the cells are split apart, they can find each other and join back together.
11Osama Bin Laden
An elephant named Osama Bin Laden was responsible for at least 27 deaths. After a 2-year rampage, the elephant was eventually shot, but some were doubtful if the right animal was killed.
12. In 1926, a raccoon named Rebecca was sent to the White House to be served for Thanksgiving dinner, but the Coolidge family kept her as a pet instead.
13. A joey is born at a very immature stage when it is only about 2 cm long and weighs less than a gram. Immediately after birth it crawls up the mother's body and enters the pouch. The baby attaches its mouth to one of four teats, which then enlarges to hold the young animal in place.
14. The Bush Baby gets its name from its distinctive call, that sounds like a wailing child. The call inspired a myth about an animal that would kidnap children who wandered outside at night.
15. The Malaysian pen-tailed tree shrew subsists on a diet roughly equivalent to 100% beer, drinking the fermented nectar of the flower buds of the bertam plant. This nectar can reach up to 3.8% alcohol content. Despite this, they don't appear to get drunk.
Miniature horses are considered service animals under The Americans with Disabilities Act and are used for people with a fear of dogs.
17. Some interesting facts about animals in winter: Hibernating woodchucks only breathe 10 times an hour. Owls store frozen voles and sit on them to thaw/eat. Arctic foxes are thermoneutral down to -112ºF. Polar bears have hollow hair that brings the sun’s heat to their black skin. Black bears lose 40% of the pre-dormancy weight.
18. The Tasmanian Devil will fly into a maniacal rage when threatened by a predator, fighting for a mate, or defending a meal. Early European settlers dubbed it a “devil” after witnessing such displays, which include teeth-baring, lunging, and an array of spine-chilling guttural growls.
19. Coyotes use their howls and yipping to create a kind of census of coyote populations. If their howls are not answered by other packs, it triggers an autogenic response that produces large litters.
20. Giraffes only need 5 to 30 minutes of sleep in a 24-hour period.
Baby otters can't swim at first, but their buoyancy makes it possible for the mother to wrap the pup in (sea)weeds to prevent it from drifting away when she needs to hunt.
22. A Chinchilla's fur is so thick and soft that fleas will suffocate if they try to live there.
23. A leopard seal once tried to teach a National Geographic photographer how to hunt.
24. Female wallabies have been known to "throw" their Joeys from the pouch if they are being pursued or feel threatened. This is a defense mechanism designed to ensure their own survival by sacrificing a Joey.
25. An animal named kinkajou which is related to raccoons, can turn its feet backward to run easily up or down trunks.