Whales and dolphins sleep one side of their brains at a time - while one side is asleep the other keeps watch for danger. Sperm whales can stay submerged for up to two hours descending over a mile below the surface. The Andes Fishing Mouse was first recorded for science when scientists from the British Mammal Society watching a television programme on the 'Wildlife of the Andes' saw a specimen in the programme and realised that no records of it existed. Rodents, at least the few species that are pests, cost us about 43 million tonnes of damaged and destroyed food every year. There is a vine in Madagascar that is pollinated exclusively by lemurs.
Chimpanzees can go bald as they age.
A female kangaroo can produce 2 different kinds of milk at the same time when she is suckling youngsters of different ages. Anteaters are the only mammals to have no teeth. Hippopotamuses produce a special reddish oil from modified sweat glands that acts like a suncream to stop them getting sunburned. Shrews evolved 54 million years ago, today some species have such fast metabolisms that they need to eat up to 1.3 times their own weight in food eveyday. What is a Mammal .