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Section 35.2Today’s Mammals
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Grouped by reproduction
Monotremes Most primitive mammals All modern monotremes live in
Australia Egg-laying mammals Three types: Duck-billed platypus and two types of
spiny anteaters
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Reproduction…
Marsupials
Most live in Australia Babies finish development in
mother’s pouch Kangaroos, wombats, koalas,
possums
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Reproduction…
Placental mammals
Most advanced mammals Live all over the world on land
and in oceans Young develop inside mother’s
uterus, attached to a placenta
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Main Placental Mammal Groups
Rodents – gnawing mammals; 40% of all placental mammals; rats, mice
Bats – flying mammals with front legs modified into wings; most eat insects, some fruit; use sonar for navigation
Insectivores – insect eaters like shrews; small with very fast metabolism
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Main Placental Mammal Groups…
Carnivores – meat eating mammals, include cat family (lion, tiger) and dog family (wolf, fox); strong and very intelligent
Pinnipeds – marine mammals with flippers for swimming that return to land to reproduce; walrus, seal, sea lions
Primates – forward facing eyes, grasping hands; apes, monkeys, humans
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Main Placental Mammal Groups…
Ungulates – hoofed mammals, grazing animals; some with an even number of toes (deer), others with an odd number (horse); many chew cud to continue digesting tough plant material
Cetaceans – marine mammals that spend entire life in sea; two groups – toothed whales (hunters) and baleen whales (filter feeders)
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Main Placental Mammal Groups…
Lagomorphs – long legs for jumping; rabbits and hares
Sirenia – barrel-shaped marine mammals; manatees
Elephants – long nose (proboscis) two groups – African and Asian