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Biology Chapter 17-5 - 1 Chapter 17 Section 5Monotremes and...

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Chapter 17 Section 5- Monotremes and Marsupials Did you know that some mammals hatch from eggs and that others spend  the first months of life in a mother’s pouch? Only a few kinds of mammals develop this way. monotreme – a mammal that lays eggs. They have all the traits of mammals. A female monotreme lays eggs with thick, leathery shells. She uses her body heat to keep them warm. After they hatch, she feeds them with mothers milk. Monotremes do not have nipples as other mammals do. Baby monotremes lick milk from the skin and hair around their mother’s mammary glands. There are only three living species of monotremes. Two are echidnas. They are about the size of a house cat. They live in New Guinea and Australia. The only other living monotreme is the platypus. It lives in Australia. The platypus is a swimming mammal that lives and feeds in rivers and ponds. It has webbed feet and a flat tail to help it move through the water.
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