Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
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
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
Dolphins have names for one another.
18
The oldest recorded elephant lived for 82 years.
213
The Lion's Mane Jellyfish is the largest jellyfish in the world. They have been swimming in arctic waters since before the dinosaurs (over 650 million years ago).
12