The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
79
Cats recognise the voice of their owner, but never evolved to care.
22
Penguins have a gland above their eye that turns saltwater into freshwater.
12
When the "Elephant Whisperer" Lawrence Anthony died, a whole herd of elephants arrived at his house to mourn him.
25
By putting a frog in a bucket of milk, scientists following up on an ancient Russian way of keeping milk from going sour have identified a wealth of new antibiotic substances.
9
Whales and dolphins can't taste anything other than salt.
11