Cats recognise the voice of their owner, but never evolved to care.
22
Using a remote-controlled camera, biologists caught dolphins getting high by sucking on puffer fish. They were even caught passing the puffer fish around.
23
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
34
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
Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
57