1. Zebras can't sleep unless they're in a group.
2. Sloth babies usually survive if they lose their grip on their mom and fall — but sometimes, the mother sloth doesn’t want to go on the ground to pick the baby up because she'd risk being seen by predators!
3. Dik-diks (tiny African antelopes) mark their territory using their tears.
4. Otters have favorite rocks that they carry around with them in their underarm pockets.
5. There's potentially a very lonely whale out in the Pacific Ocean who sings at such a high frequency that no other member of its species can hear it.
6. Mice can sense when other mice are sad. Then they feel sad too.
7. Cows have best friends, and they feel sad when they're not around.
8. If you remove the most aggressive males from a baboon troop, the troop will become more peaceful and "learn the value of tolerance, peacemaking and mutual hip-hugging."
9. Jellyfish don't have hearts.
10. And elephants can't jump.
11. Chimpanzees don't really like to swim because it's hard to keep their heads above water.
12. When one wolf leaves the pack, wolves that are left behind will howl.
13. If a female ferret in heat fails to find a mate, she dies.
14. Red foxes are monogamous and mate for life.
15. Listening to slow songs like "Everybody Hurts" by R.E.M. can help cows produce more milk.
16. Gray squirrels constantly forget where they bury their nuts.
17. And finally, baby birds have their own version of "baby talk" that they use until they learn how to sing correctly.
This post was translated from German.