A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Only 3% of bird species have penises.
0
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10
When dragonflies mate, their tails form a love heart.
22
Mahatma Gandhi used to travel with his goat so that he could have fresh milk.
11