Rattlesnake mating sessions have been known to last more than 22 hours.
232
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
Jellyfish as a species are actually older than dinosaurs and sharks.
383
When Koko, the gorilla famous for knowing sign language, was asked where gorillas go after death, she responded by signing “Comfortable hole, bye.”
23
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20