Internet Assignment biology 101

Internet Assignment biology 101 - Nicole Marshall Internet...

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Nicole Marshall Internet Assignment Bio 101 Adaptations of Birds for Flight. 1. What class are birds in? Birds belong to the Class Aves. 2. What characteristics are common to this class? (there are quite a few  here) All birds belonging to the Class Aves have several major features in common  with each-other including that all have feathers, wings which arise from  modified forelimbs, no teeth, scaly feet, a four-chambered heart, ability to lay  eggs, shoulder blades that are joined like a wishbone and are warm blooded. 3. What famous fossil shows intermediate characters between birds and  reptiles? The evolutionary jump from reptilian to birds is best demonstrated in the ancient fossilized remains of Archaeopteryx. This specimen is unique because it had feathers, teeth, and reptilian like claws. 4. What fossil birds have been found at Rancho La Brea? (there is a link to  their site.) What is the approximate age of these fossils? At the Rancho La Brea tar pit site scientists have uncovered more than twenty  different species of fossilized birds and over 100,000 total specimens.  The  fossil record includes a variety of members: the Golden Eagle, Bald Eagle,  Woodward Eagle, Grinnell’s Crested Eagle, California Condors, Vultures, and  Merriam’s Teratoms.  Fossil deposits at this site first started to form 40,000  years ago. Below list the ways in which birds have adapted their anatomy and physiology  to flight. Bones: The bones of bird are far less numerous as compared with other animals.  Bird’s  bones designed to be lightweight are hallow yet strong allowing them to fly.  Internally they are reinforced with struts for added support. Internal organs: Internally birds are like well oiled machines in order to reach great flight speed  birds have very efficient organ systems.  Their lungs are bathed in a constant  stream of fresh air due to the adaptation of air sacs.  The bird’s nine air sacs also  act to balance them, as shock absorbers and as means of cooling them off. 
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Birds have a heart that is very similar to the human heart, being four chambered  and large for their size.  Birds have a structure known as a crop with enables  them to gain large amounts of food and store it.  Bird’s digestive system is also  made up of two stomachs in order to help them quickly break up and absorb their  food supply. Muscles:
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This note was uploaded on 03/11/2008 for the course SCI BIO 303 taught by Professor Campbell during the Spring '08 term at Cal Poly Pomona.

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Internet Assignment biology 101 - Nicole Marshall Internet...

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