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As a juvenile ( adjective as noun : juvenility ; from Latin iuvenis = teen ') is called in biology and medicine Childhood - and youth stages of the developmental stage of an organism prior to maturity . The juvenile stage is followed by the adult stage. It is preceded by the embryonic stage.

In birds , the plumage that a bird wears in the juvenile stage from flying out to the first moult is called youth plumage . There may be several intermediate steps here before the adult stage is reached; Birds that are no longer juvenile but not yet adult are called immature .


  1. ^ Lars Svensson, Peter J. Grant, Killian Mullarney, Dan Zetterström: Der neue Kosmos Vogelführer . Kosmos, Stuttgart 1999, ISBN 3-440-07720-9 .