There is a sea snail that wears a suit of iron plated armor. It is the only known animal to use iron sulphide as skeletal material.
9
The elephant brain weighs about 6,000g.
274
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Only 3% of bird species have penises.
0
Penguins have a gland above their eye that turns saltwater into freshwater.
12
A cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
293
In Australia, there are spiders big enough to eat snakes.
20
When a drone bee mates with a queen, its ejaculation is so powerful that it can even be heard by the human ear.
5