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Growth rates of great egret, snowy egret and black-crowned night-heron chicks

Colonial Waterbirds

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Abstract

Growth rates of Great Erget (Casmerodius albus), Snowy Erget (Egretta thula), and Black-crowned Night-Heron (Nycticorax nycticorax) chicks to 18 days-of-age were estimated from repeated measurements of chicks in broods of three young. Weight gain (g/day) or increase in length (mm/day) of forearm, tarsus, or culmen did not between Black-crowned Night-Heron chicks at a colony in Rhode Island and a colony in Texas (USA). In Black-crowned night-Herons and Great Egrets, the last chick (C-chick) to hatch had lower growth rates than the first (A-) or second (B-) hatched chick. Black-crowned Night-Heron and Great Egret A-chicks gained weight faster than Snowy Egret A-chicks; however growth rates of the forearm, tarsus, or culmen each were not different among the three species. Equations based on the growth rate of culmen, forearm, or tarsus for repeatedly measured A-chicks estimated age of Great Egret, Snowy Egret, and Black-crowned Night-Heron chicks collected elsewhere to within two days of known age.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Growth rates of great egret, snowy egret and black-crowned night-heron chicks
Series title:
Colonial Waterbirds
Volume
14
Issue:
1
Year Published:
1991
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
46-50
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Colonial Waterbirds
First page:
46
Last page:
50
Number of Pages:
5