Nestling
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<birdfyi-glossary slug="nestling"></birdfyi-glossary>정의
A young bird that remains in the nest and is entirely dependent on its parents for food and warmth.
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Nestlings of altricial species (passerines, raptors, herons) are entirely dependent on parents for thermoregulation (brooding) and food delivery. They develop rapidly, typically fledging in 10-30 days. Their brightly colored gapes and solicitation calls (begging) stimulate parental feeding responses — the gape color signals hunger level and health to parents making allocation decisions among nest-mates. Nestlings eject fecal sacs (in passerines) or defecate over the nest rim (in raptors), maintaining nest hygiene.