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Diversity of Mammals

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by

Katelynn Dorn

on 2 May 2014

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Transcript of Diversity of Mammals

Monotremes
lay eggs!
have a cloaca
young are nourished by milk from pores on mother's abdomen
platypus, spiny anteater, echidna
Placental Mammals
The rest!
placenta- joins embryo's tissues with mother's tissues to exchange nutrients, gases, and wastes
allows for longer gestational period
mice- few weeks
human- 9 months
elephant- 2 years
care for young by nursing after birth

Marsupials
viviparous
young embryo crawls into mother's pouch and attaches to nipple for milk
stays in
marsupium
until old enough to survive on its own
kangaroos, koalas, and wombats
Diversity of Mammals, 32-2
Diversity of Mammals
Biogeography of Mammals
continental drift separated unique groups of mammals
Full transcript