NEM 10V Lecture Notes - Lecture 40: Echidna, Nematology, Jelly Bean
Nematology
Part 14: Mammals:
• All mammals share two traits.
• They feed their young with mother’s milk, and they have hair or fur.
• Typically, they produce fewer offspring than other groups, but their young have a much
higher rate of survival than most other animals.
• There are 3 main categories of mammals.
• The Marsupials are mammals with pouches and include:
1. kangaroos,
2. koala bears
3. opossums.
• Newborns are not fully developed when born and must crawl across the mother’s fur to
reach the pouch where they will receive milk, and live until they are fully developed.
• The Monotremes are the egg laying mammals the platypus and echidna.
• When they hatch, the young are about the size of a jellybean.
• Until they are fully developed, they drink milk that oozes from the surface of the
mother’s belly.
• Most Marsupials and Monotremes are found in Australia and New Zealand.
• Opossums are found in the Western Hemisphere.
• Placental mammals have an organ called the placenta that provides nutrients to
developing offspring, and they occur worldwide.
• Compared to other mammals, placental mammals have a higher metabolic rate, better
body temperature control, and a more efficient way to nourish embryos.
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