The elephant brain weighs about 6,000g.
274
There's a rare breed of pig that looks like a sheep.
14
The colossal squid has the largest eyes in the world.
4
Cats recognise the voice of their owner, but never evolved to care.
22
Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
10
A 42-foot sperm whale has about 7 tons of oil in it.
209