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1
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The act of keeping the eggs warm until they are hatched
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2
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Fused collar bones which are referred to as 'the wishbone'
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4
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This process is where birds lay amniotic eggs encased in a hard, calcium-containing shell
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5
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In relation to the size of a bird's body, they have a relatively large ______.
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6
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Number of chambers in a bird's heart
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9
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This order contains the world's largest birds
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12
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A bird's forelimbs are modified into a pair of _____.
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13
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The class which birds belong
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14
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Specialized contour feathers found on the wings and tails of birds
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17
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When birds lose and regrow their feathers
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20
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The tube that leads from the single ovary, where fertilization occurs and through which eggs pass into the cloaca
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21
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Birds have thin, lightweight, ______ bones that allow for flight
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22
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Seasonal movement from one habitat to another
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23
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Members of the order, GALLIFORMES, are often referred to as '_____'
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24
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In place of teeth, all birds have this structure which allows for grasping food
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27
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The soft, fluffy feathers that cover the body of very young birds and provide insulating undercoat in adults
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