NidicolousHatching in a relatively undeveloped state and remaining in the nest for a period while completely dependent on parental care. Nidicolous (also called 'altricial') young are typical of birds which build substantial nests in well hidden or inaccessible places, notably all the passerine groups, and they are naked, blind and completely helpless when first hatched. Young birds which are not nidicolous are nidifugous.
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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver