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Annual Molt in Ruby-Throated and Black-Chinned Hummingbirds

William H. Baltosser
The Condor
Vol. 97, No. 2 (May, 1995), pp. 484-491
DOI: 10.2307/1369034
Stable URL: http://www.jstor.org/stable/1369034
Page Count: 8
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Annual Molt in Ruby-Throated and Black-Chinned Hummingbirds
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Abstract

Details of the annual molt in Ruby-throated Hummingbirds (Archilochus colubris) and Black-chinned Hummingbirds (Archilochus alexandri) are presented. Young of both species hatch essentially naked but within three weeks acquire a full set of feathers. After the birds migrate to winter quarters, these feathers are replaced completely before the first year of age and annually thereafter. The postnuptial molt in adult males and females is similar within species and proceeds at about the same rate. The same is true for young birds in juvenal plumage, though molting is generally initiated and completed later than in adults. The period required for the molt of remiges and rectrices in an individual is estimated at around four months, while on a population basis it is underway for 7-8 months. Comparisons of the annual molt in Ruby-throated and Black-chinned Hummingbirds to other hummingbirds show that there are numerous similarities, differences being primarily attributable to migrant versus resident status. /// La muda anual está detallada en el Chupaflor Garganta de Rubí (Archilochus colubris) y el Chupaflor Terciopelo Barbanegro (Archilochus alexandri). Jovenes de los dos especies empollan esencialmente nudos pero dentro de tres semanas adquieran un completo vestido de plumas. Después las aves migrar a sus sitios invernales, estas plumas son repuestas completamente a dentro del año primero y anualmente después de eso. La muda de adultos es semejante en machos y hembras en cada especies y procede mas o menos en los mismos incrementos proporcionales. Esto también es verdad para los juveniles, aún ellos por lo general inician y completan la muda después de los adultos. La muda de las primarias y secundarias y plumas de la cola dura unos quatro meses en aves individuales y 7-8 meses en poblaciones. Comparaciones en la muda entre estas y otras chuparosas muestran numerosos similitudes, y las diferencias son primariamente entre los especies que son residentes contra migratorios.

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