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 this flightless bird?
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What is the common name of the bird Heliomaster longirostris?
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What is the lateral area posterior to the side of the bird’s body that extends back to the base of the tail?
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What distinctive trait allows this bird to easily gather food?
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What is the upper front part of a bird called?
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