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Mammals

Mammals. Period 3 Kristi Schmura, Caitlin Yakopin May 19, 2009 . Diversity . -There are about 4,500 species of mammals -There are three main groups, monotremes, marsupials, and placental mammals. . Monotremes : The mammals that lay eggs.

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Mammals

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  1. Mammals Period 3 Kristi Schmura, Caitlin Yakopin May 19, 2009

  2. Diversity -There are about 4,500 species of mammals -There are three main groups, monotremes, marsupials, and placental mammals. • Monotremes: The mammals that lay eggs. • Marsupials: The pouched mammals. (Examples- kangaroos, opossums, and koalas) • Placental Mammals: The embryo completes its development while protected in uterus. By far, most diverse group. 4,200 known species out of 4,500 species with mammals.

  3. 9 General Characteristics of mammals • Hair • Mammary Glands • Three middle ear bones • Diaphragm • Four chambered heart • Endothermy • Diphyodonty • Lower jaw made of single bone • Large cerebral cortex

  4. Body Support or Skeleton/Movement • Skull, backbone,(vertebrae), hinged jaw, paired limbs, muscles attached by tendons, the bones move the jointed skeleton, enable animal to walk/fly/swim.

  5. Reproduction • Sexual reproduction; internal fertilization with the exception of the egg-laying mammals, embryos develop internally. Mammal young are nourished with milk from mammary glands of female. In the pictures below, the egg and sperm meet in the oviduct where fertilization takes place.

  6. Digestion • Complete digestive tract; organs; include mouth, pharynx, esophagus, stomach, intestines, liver, pancreas, and anus.

  7. Mammals • Deer • Wolves • Elephants • Giraffes • Tigers • Dogs • Cats • Humans • Chipmunks

  8. Bibliography http://animals.about.com/od/mammals/tp/mammal_characteristics.htm http://www.earthlife.net/mammals/reproduction.html http://www.earthlife.net/mammals/diet.html http://www.nsrl.ttu.edu/tmot1/diversit.htm http://www.sciencemag.org/cgi/content/abstract/245/4913/45

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