Chapter 15.2b - Mrs. Tucker's Science

Chapter 15.2b - Mrs. Tucker's Science

CHAPTER 15.2B Mammals Types of Mammals There are 3 groups of mammals based on the development of their young. There are monotremes, marsupials, and placentals. Monotremes Monotremes

are mammals that lay eggs with leathery shells. An example would be a duckbilled platypus. Marsupials Most marsupials live in Australia, New Guinea, or South America. Marsupials give birth to

immature young that need to finish developing in an external pouch on the mother. Examples are kangaroos, opossums, wallabies, koalas, bandicoots, and Tasmanian devils. Placentals In placental mammals the young develops in the mother during a gestation period.

Gestation periods are different on the type of animals. Placental mammals get their name from the placenta, an organ that helps feed the young. Examples: humans, elephants, horses, cows, manatees, rabbits, etc.

Types of Placental Mammals Rodentia beavers, mice, rats, squirrels 1 pair of long front teeth for gnawing, herbivores Chiroptera bats front limbs are adapted for flying, active at night, eats insects, fish, or other bats. Insectivora moles, shrews, hedgehogs small, feed on

insects, earthworms, or other small animals. Have a long skull and narrow snout. Carnivora cats, dogs, bears, foxes, raccoons long, sharp canine teeth, most are predators, some are omnivores. Primates apes, monkeys, humans arms with grasping hands and opposable thumbs, eyes face forward, large brains, omnivores.

Artiodactyla deer, moose, pigs, camels, giraffes, cows hooves with even number of toes, most are herbivores, complex digestive system. Cetacea whales, dolphins, porpoises 1 or 2 blowholes on top of head for breathing, flippers, teeth or baleen. Lagomorpha rabbits, hares,

and pikas long hind legs for running and jumping, one pair or large, upper incisors. Pinnipedia sea lions, seals, walruses marine carnivores, limbs for swimming. Edentata anteaters, sloths, armadillos eats insects and small animals, most toothless or small teeth. Perissodactyla

horses, zebras, tapirs, rhinos hooves with an odd number of toes, skeletons for running, herbivores with large molars. Proboscidea elephants long nose called a trunk, herbivores, tusks, thick, leathery skin.

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