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1 March 2001 Postnatal Development of the Violet Sabrewing in Costa Rica
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I observed the incubation and nestling periods of five nests of the Violet Sabrewing (Campylopterus hemileucurus) in Costa Rica. Each nest was built above running water. Mean incubation period was 20 d and only the female incubated. Mean nestling period lasted 23 d. Nestlings reached and surpassed adult mass before fledging (132% of adult size in males and 130% in females), although wing, tail, and culmen length did not reach adult size until after fledging. Because the Violet Sabrewing is highly sexually dimorphic in size and plumage color, I compared the postnatal development of five females and two males. Males were heavier than females and grew more slowly, consistent with generally slower growth rates in larger birds. The T(10–90) period was 15.3 d for the fastest growing male and 13.8 d for the fastest growing female.

MANUEL MARÍN "Postnatal Development of the Violet Sabrewing in Costa Rica," The Wilson Bulletin 113(1), 110-114, (1 March 2001).[0110:PDOTVS]2.0.CO;2
Received: 26 June 2000; Accepted: 1 February 2001; Published: 1 March 2001
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