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Transcript of Class Aves
They use long flat bills to grasp fish
They have to eat a lot to regain body heat
Bird's crop moisten the food to move it further down the digestive tract. Birds have a 4 chambered heart and 2 circulatory loops.
There is a complete separation of oxygen rich and oxygen poor blood. Birds have large brains in proportion to their body
They can sometimes see better than humans When birds breed their sex organs grow and shrink when breeding season is over
Birds have amniotic eggs and stay with the egg until it hatches Nitrogenous wastes removed by kidneys, converted to uric acid, and deposited into the cloaca. Most of the water is reabsorbed, leaving uric acid crystals in a white, pasty form - bird droppings They can fly, swim, walk/run Flying birds have a more rigid skeleton than a reptile because many of their large bones, such as the collar bone, are fused together to form a sturdy frame that helps the muscles during flight. They have large chest muscles that
power the upward and downward wing
strokes. Interesting Facts Puffins have an extra bone in their jaws which allows them to open their bill and to keep both mandibles parallel. This allows them to hold a whole row of fish without the ones near the tip falling out. In some birds, such as Starlings, their eyes are the heaviest part of their head. Starlings eyes are 15% of their head weight.