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Mammals
Dalton SettlesPeriod 6
March 31, 2010
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Marsupials
• Their young develop in a pouch.
• After growing inside the pouch, the young are forced to live on their own.
• The most common marsupials are kangaroos, and opossums.
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Monotremes
• Monotremes lay eggs.• The eggs are soft shelled
and incubated outside the body.
• There are only three types of monotremes know today. The duckbill platypus and two types of anteaters.
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Placental Mammals
• In placental mammals, nutrients, oxygen, carbon dioxide, and wastes are exchanged between the embryo and the mother through the placenta.
• Insectivores: long narrow snouts and sharp claws that are used for digging.
• Sirenians: herbivores that live in rivers, bays, and warm coastal waters. These are large slow moving animals.
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More Placental Mammals
• Cetaceans: animals that lead a fully aquatic lives but must come to the surface to breathe.
• Chiropterans: winged mammals, and the only mammals capable of true flight.
• Rodents: single pair of long curved incisor teeth in both their upper and lower jaw.
• Perrisodactyls: hoofed animal with an odd number of toes on each foot.
• Artiodactyls: hoofed animals that have and even number of toes on each foot.
• Proboscideans: mammals with trunks, like elephants.• Xenarthrans: small mammals, most have no teeth.
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Biogeography
• There has been convergent evolution around the world because there are many similar climates.
• Convergent Evolution: the appearance of similar structure in organism of different lines of descent.
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Bibliography
• Photograph. Web. <http://soer.justice.tas.gov.au/2003/image/559/ilw/p-platypus_m.jpg>.
• Web. <http://www.enchantedlearning.com/subjects/mammals/Placental.shtml>.
• Web. <http://www.sacrs.org.za/ecm21/gallery/giraffe-01300813b.jpg>.
• Web. <http://www.royalpetclub.com/blog/wp-content/uploads/2010/01/541447Australian-Kangaroo-Posters1.jpg>.
• Miller, and Levine. Biology. Print