Abstract
Vocal development was followed in laboratory-reared American Coots (Fulica americana). Four call types were observed in young chicks: twitter, wit-ou, squawk, and yeow. During the first month all calls showed changes in pitch. Call duration showed no change in the twitter and yeow calls, but showed an increase in both the wit-ou and squawk calls. Twitters were dropped from the repertoire after 30 days of age, whereas yeow calls were dropped after about 2 months of age. When approximately 2 months old, juveniles used three calls, one derived from the squawk, and two derived from the wit-ou. Sexual dimorphism also developed when birds were about 2 months old. By 3 months of age, juvenile calls resembled those of adult coots.
Publisher
Canadian Science Publishing
Subject
Animal Science and Zoology,Ecology, Evolution, Behavior and Systematics
Cited by
28 articles.
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