Monotremes are found only in Australia and on the island of New Guinea. the echidna or spiny anteaters live on land and feed on ants and worms. The duckbills live in the rivers and lakes and eat snails, crabs, and worms. In Greek, 'mono' means 'single' and 'trema' means 'hole' (cloaca). These animals got their name because they have cloaca, openings through which urine, stool, and eggs pass out of their bodies. Although the monotremes lay eggs and hatch them, they still belong to the class of mammals. The females do not have any nipples like the other mammals, but instead have mammary glands in their abdomens from which milk is secreted. The hatched young ones lick this milk from the skin of the mother.
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