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Readers Digest Sound Waves
2,571 wordsThere are many differences between Dolphins and Porpoises. People might think that the two are the same mammal, but they are not. Dolphins have cone-shaped teeth and porpoises have spade-shape teeth. The easiest way to tell them apart is that the porpoise is smaller in size and is broader across the back. Dolphins are classified in the Delphinidae species and there are thirty to fifty different kinds of species in this family (Min asian 204). The Porpoises are classified under the Phoceonidae fa...
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Platypus Ornithorhynchus Anticus Platypus Ornithorhynchus Anticus Celebrating Sleep
1,399 wordsThe platypus, apparently, is a surprisingly deep sleeper. What's more, it spends more of its time in so-called 'REM's leep than any other mammal. These are the conclusions of a study on sleep in the platypus by Jerry M. Siegel of the Sepulveda Veterans' Affairs Medical Center, North Hills, California and colleagues. Their report appears in a special number of Philosophical Transactions of the Royal Society devoted to the biology of the platypus (Ornithorhynchus anticus), celebrating the bicenten...
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Times Per Minute Body Temperature Falls Hibernation
1,829 wordsHibernation: Definition Hibernation is an inactive, sleep like state that animals must go and at least one bird enter during the winter. Animals that hibernate shelter themselves from harsh winter and reduce their need for food. Their body temperatures are considerably lower, as well as their heartbeat and breathing. The true hibernator spends most of the winter in a state close to death; in fact the animal may appear to be dead. The body temperature is close to zero degrees; the respiration is ...
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Cold Blooded Oxygenated Blood
1,437 wordsMammals have existed for the past 200 million years. According to fossil evidence, they evolved from a mammal like reptile group. These reptile ancestors were small, active carnivores. They were equipped with several specialized types of teeth. Their limbs were positioned more directly under the trunk as opposed to spreading out to the sides. Both of these characteristics are prominent features of mammals. For the past 70 million years mammals have been the dominant animals in terrestrial ecosys...
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