Birds

Also called the operculum, what is a smooth and featherless patch of skin on a bird located where the beak attaches to the forehead?

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What is the common name of the bird Apus unicolor?
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What is the common name of the bird Ducula pickeringii?
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What is the small joint on the bird’s wing?
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What is the common name of the bird Platalea minor?
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What is the common name for a bird's Y-shaped collarbone?
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Which species best matches this description, "type of grouse that live in North American grasslands"?
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An 1866 Edouard Manet painting is of a woman and what brightly-colored bird?
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When do swans usually mate?
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