The reindeer is the only mammal that can see UV light.
17
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
There's a young hippo and a 130+ year old tortoise in a Kenyan wildlife preserve who are best friends and they even sleep and play together.
40
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Baks the blind boxer has a seeing eye goose named Buttons; a four-year-old goose who leads the pup around everywhere either by hanging onto him with her neck, or by honking to tell him which way to go.
16