Tigers can see 6 times better at night than humans.
305
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
Sharks, like other fish, have their reproductive organs in their chests.
248
The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
2