B240Birds[1]

B240Birds[1] - Birds The dinosaurs of today! What is unique...

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Birds The dinosaurs of today!
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What is unique about birds? Feathers (probably shared with some dinosaur ancestors) Skeleton adapted for flight. Light weight hollow bones, breast bone and tail bone Efficient lungs No teeth
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Feathers are homologus to reptilean scales
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• Birds and dinosaurs share over 20 skeletal traits • Some dinosaurs had feathers • The are a number of fossils species transitional between dinosaurs and birds
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This is a 130-million-year-old fossil dinosaur discovered from China • It was covered from head to tail with downy fluff and primitive feathers. • The first dinosaur found with its entire body covering intact, • The best evidence yet that bird ancestors developed feathers for warmth before they could fly.
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Modern birds are warm-blooded and their feathers play an integral role in keeping them warm, It’s reasonable that non-avian dinosaurs developed primitive feathers at the same time that they developed warm- bloodedness Smaller dinosaurs and even the young of larger species like Tyrannosaurus rex may have needed featherlike body coverings to maintain their body temperature." Microrapter
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Archaeopteryx : An Early Bird, originally described as a skeleton of a small bipedal dinosaur
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Skeletal Adaptations Birds have lightweight bones, many of which are hollow. They have fewer bones than reptiles and mammals do. For added strength, the hollow bones are supported by internal struts (much like the struts that support the hollow wings of planes).
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Efficient Lungs Air sacs permit one way flow of air through the lungs. This means that air moving through bird lungs is
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This note was uploaded on 09/23/2011 for the course BIOL 240 taught by Professor Staff during the Spring '11 term at S.F. State.

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B240Birds[1] - Birds The dinosaurs of today! What is unique...

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