1. A newborn koala joey is about the size of a large jelly bean. Cee / BuzzFeed After it's born, the joey makes its way to the pouch (with no help from mum!). It stays there for a few months until its eyes, ears, and fur develop. 2. Cows have best friends too! Cee / BuzzFeed In a study, cows were penned for 30 minutes intervals twice, once with a "best friend", and once with a cow it wasn't familiar with. It turned out that, when placed with their best friend, their heart rates and stress were significantly lower. 3. Crocodiles carry pink flowers and take part in activities that are purely for fun. Cee / BuzzFeed They seem to be attracted to floating debris like leaves, feathers, and petals —especially pink ones. 4. A baby fish is called a fry. Cee / BuzzFeed How adorable! 5. Bees recognise human faces! Cee / BuzzFeed Adrian Dyer from Monash University trained bees to associate pictures of human faces with tasty sugar snacks, and it worked! 6. Squirrels often forget where they buried their acorns, which means that they've probably helped grow trees. Cee / BuzzFeed Gray squirrels might eat a lot of acorns but it turns out they fail to recover up to 74 percent of the acorns that they stored! This, of course, plays a small role in the regeneration and dispersal of oak. 7. Rats laugh when they're tickled. Cee / BuzzFeed Ishiyama states that over time, the rats learn that it's fun to play with the big hand which tickles them, so they start chasing it and even recognise it as a playmate. 8. Sea otters hold hands when they're sleeping. Cee / BuzzFeed The group of otters hold hands and tangle themselves in kelp forests to make sure they don’t drift apart. 9. Basenji dogs don't bark much, but they yodel instead. Cee / BuzzFeed Basenjis are known for being a very quiet breed, as they have flat larynxes. Because of this, these dogs yodel instead of barking. 10. Seahorses pair for life. Cee / BuzzFeed They meet first thing in the morning to reinforce their pair bonding with an elaborate courtship display. 11. Crows are so smart, they play pranks on each other! Cee / BuzzFeed Not only do these clever creatures play pranks on each other, but they also tease other animals, and engage in aerial acrobatics for fun. 12. Cheetahs can't roar — instead, they just meow, purr and chirp. Cee / BuzzFeed Much like pumas, cheetahs possess small-cat anatomy, which means that they're not able to ~roar~. 13. Some birds sing to their unborn chicks to warn them about the hot weather. Cee / BuzzFeed Chicks that grew up in hotter nests tended to weigh less than those raised in cooler nests. 14. Baby porcupines have soft quills at birth! Cee / BuzzFeed It doesn't last for a long time though — it hardens very quickly in a few days. 15. Baby elephants suck on their trunks for comfort. Cee / BuzzFeed It's exactly the same reason as why babies suck on their thumbs! 16. While mums hunt for food, emperor penguin dads fast for approx. two months in order to protect their egg from the cold. Cee / BuzzFeed The mums return in a few months, bringing food in their bellies, which they regurgitate for the chicks to eat. 17. Ōkunoshima, Japan, is an island which is home to a whole bunch of bunnies. Cee / BuzzFeed Nobody knows for sure how all the rabbits got there. 18. Studies show that sheep can recognise facial expressions. Turns out, they really like it when you smile. Cee / BuzzFeed Dr Kendrick states, "The way the sheep's brain is organised suggests they must have some kind of emotional response to what they see in the world." 19. And finally, a newborn polar bear weighs nearly as much as an adult ground squirrel. Cee / BuzzFeed The newborn baby polar weighs only 2 pounds or 0.9 kilogram!