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2 
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Birds are endothermic, meaning warm ____ 
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4 
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The ___can move its head to see behind him 
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5 
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A bird's ____weigh more than its skeleton 
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7 
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Feathers facilitate flight, insulation and _____ 
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9 
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Birds can be found on every ___ 
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10 
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The ___ builds the largest tree nest  (2 words) 
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13 
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The only wingless bird in the world is the ____ 
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14 
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Birds evolved from small meat-eating ____ 
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17 
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Ostriches and ___are birds that don't fly. 
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18 
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75% of wild birds ___before they are 6 months old 
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