Birds

What are the feathers in a triangular area on the underside of a bird between its vent and the base of its tail feathers?

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Which of the following is true about a Hummingbird?
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On a bird, what is the area between the chin and the foreneck called?
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What kind of bird has an eye bigger than its brain?
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What is the upper front part of a bird called?
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Which of these are large birds that nest on the ground?
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