Characteristics & Diversity of Birds

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Presentation transcript:

Characteristics & Diversity of Birds Section 34.3

Key Characteristics Feathers: Contour feathers – give shape Flight feathers are contour feathers on wings and tail Down feathers – on young birds & under contour feathers; provide insulation

Contour feather anatomy

Down feathers

Key Characteristics … Strong, lightweight skeleton Bones are thin and hollow Keeled breastbone provides for wing muscle attachment

Bird skeleton with keeled breastbone

Key Characteristics… Efficient lungs – contain air sacs which maintain oxygen absorption even when exhaling

Bird air sacs

High body temperature due to high metabolic rate Key Characteristics… Endothermic metabolism High body temperature due to high metabolic rate

Key Characteristics… Four chambered heart – ventricle is completely divided

Bird heart – 4 chambers

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