The reindeer is the only mammal that can see UV light.
17
It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
109
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Condoms were originally made of animal intestines or linen.
347
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17