found: Work cat.: A guide to nestling development and aging in altricial passerines, 2007:p. 1 ("Ornithologists categorize birds over an altricial to precocial spectrum, based on differences in the rate of growth and type of development young birds will undertake ... In general, altricial species can grow at 3-4 times the rate of precocial species"; altricial birds)
found: The American heritage dict. of the Engl. lang., via WWW, Apr. 7, 2008(altricial: Helpless, naked, and blind when hatched: altricial birds)
found: Web. 3(altricial: having the young hatched in a very immature and helpless condition so as to require care for some time (altricial birds))
found: Henderson's dict. of biological terms, 2000(altricial: requiring care or nursing after hatching or birth)
found: LC database, Apr. 7, 2008(titles: Imprinting in altricial birds; Avian growth and development : evolution within the altricial-precocial spectrum)
