Birds

What is the sac located on the bird's neck that is inflatable and is only visible in males during courtship displays?

More Questions from Birds
What is the common name of the bird Tetraogallus caucasicus?
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What is the common name of the bird Goura cristata?
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What bird lives in Antarctica?
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Which bird from Roman tales fed on human blood?
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What is the common name of the North American bird Strix occidentalis?
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Which of the following is a bird of prey?
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What European bird was imported to America by the administration of Franklin Pierce in hopes of ridding Brooklyn, New York, of a plague of canker worms that was infesting the trees?
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Which of the following is not a type of bird?
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