Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
57
Dolphins have names for one another.
18
Sharks, like other fish, have their reproductive organs in their chests.
248
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
109
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10