ENSC 2000 Study Guide - Quiz Guide: Seaweed, Blue Mussel, Purified Water
5 Nov 2017
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In order to age a black capped chickadee (poecile atricapillus, figures 1 and 2), you must inspect the tail feathers for signs of wear. A worn out tail indicates that it is a younger bird who has not regrown its tail feathers, whereas a squared off, smooth edged tail indicates that it is an adult bird who has regrown its tail feathers. Sexing a black capped chickadee is much harder to do compared to aging. Sexing can only be done during breeding season, where a male black capped chickadee will have an enlarged cloaca, known as a cloacal protuberance. A female black capped chickadee can also be sexed during the breeding season where she will have missing feathers on her belly, known as a brood patch. The american redstart (setophaga ruticilla) is a species of bird that spends its summer breeding season in north and central america in wooded habitats, forests, and deciduous woodlands (thomas et al.
