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Leaving the nest a short time after hatching. Used of a bird.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
nidifugous(of young birds) hatching in a condition allowing departure from the nest within a few hours of birth; such birds spend the fledging period away from the nest. Waders are an example.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005