The cat brain weighs about 30g.
167
Squirrels forget where they hide about half of their nuts.
698
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
Sloths take two weeks to digest their food.
243