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?

More Questions from Birds
What is the combination of the eye ring and supraloral line on a bird called?
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In 2018, how many Major League Baseball team's logos were represented by a bird?
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What is the only bird that can fly backwards?
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What U.S. state nicknamed "Badger State" has the Robin as its state bird?
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What is the state bird and state tree of Utah?
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On a bird, what is essential for low speed flight and aid in coordinated landing and take-off?
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What type of bird is on the album cover of Stevie Nicks' "Bella Donna"?
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What is the lower most ridge on the lower mandible on a bird called?
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