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Apes
Enchanted Learning
ALL ABOUT MAMMALS!

Geologic Time Chart
Introduction to Mammals Groups of Mammals Ice Age Mammals Mammalian Evolution Classification Mammal Index Activities and Worksheets
Groups of Mammals
Monotremes Marsupials Placental Mammals
Monotremes

Monotremes are the most primitive mammals. There are three species of monotremes, the duck-billed platypus (Ornithorhynchus) and two spiny anteaters, or echidnas (Tachyglossus and Zaglossus). These mammals lay eggs; after the babies hatch, the mothers nourish their young with milk. Today, monotremes live only in Australia and New Guinea. The name monotreme means "one-holed," referring to the cloaca, a single hole that serves the urinary tract, anus, and reproductive tract in monotremes.

Monotreme Printouts:


Duck-Billed Platypus

The Duck-billed Platypus is a primitive mammal from Australia. Go to a platypus guiz or go to the answers.


Monotremes

Monotremes are primitive, egg-laying mammals. Spiny anteaters and the duck-billed platypus are monotremes.


Spiny Anteater

Also called the echidna, this is a primitive, egg-laying mammal from Australia and New Guinea.


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