The Basenji dog is the only dog that is not able to bark.
4
The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
79
Condoms were originally made of animal intestines or linen.
347
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
In 2011, a male tiger in India adopted a litter of orphaned cubs, taking on the role of ‘mother’. Wildlife officials say such behavior had never been observed before.
9
Tigers can see 6 times better at night than humans.
305
When Koko, the gorilla famous for knowing sign language, was asked where gorillas go after death, she responded by signing “Comfortable hole, bye.”
23