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C L A S S

A V E S. C L A S S. Birds. Class Aves. 8600 species One of the most common vertebrates Sometimes called feathered dinosaur Evolved from small, two-legged dinosaurs Clawed toes and scales on feet Internal fertilization Reproduce with amniotic egg. Feathers.

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C L A S S

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  1. A V E S C L A S S Birds

  2. Class Aves • 8600 species • One of the most common vertebrates • Sometimes called feathered dinosaur • Evolved from small, two-legged dinosaurs • Clawed toes and scales on feet • Internal fertilization • Reproduce with amniotic egg

  3. Feathers • Feather- lightweight, modified scale that provides insulation and enables flight • Run bills through feathers to keep them in good condition for flight • This is called preening • Use bill to rub oil on feathers • Helps water birds to waterproof their feathers

  4. Feathers • Feathers wear out and must be replaced • They molt by shedding old feathers and growing new ones • Summer is when most birds molt • Do not lose all feathers at once • They still have to fly • Lose tail and wing feathers in pairs

  5. Wings • Wings are a second adaptation for flight • Sternum, large breastbone, have powerful muscles attached to it • They are also attached to a bone in the upper wing • The muscles help produce a lot of power so they can fly

  6. Flight • Flight requires lots of energy • Several factors contribute: • Four-chambered heart- rapidly beats and this helps the oxygenated blood travel faster through the body • Respiratory system- supplies oxygenated air to the lungs when it inhales and exhales • Has lungs, also anterior and posterior air sacs

  7. Endothermic • Can maintain their own body temperature • Do not depend on their environment • Feathers are a major part in helping them maintain body heat • They will fluff their feathers and trap air under them to help body heat from escaping • Because they are endothermic they can live in any environment • Have to eat large amounts of food to keep large amounts of energy

  8. Reproduction • Internal fertilization • Reproduce by amniotic egg • Make nest to hold eggs • Eggs have hard shells • Nest are made of many different things like straw, sticks, etc. • Once they lay their eggs they do not leave them

  9. Reproduction • They sit on their eggs to keep them warm which is called incubation • Periodically they turn the eggs so they produce properly • Eggs are most of the time distinctive • You can tell what kind of bird it is by the shape, color, and size of the egg

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