This is a guide to altricial passerines. It has an explanation of variables used for aging birds and an explanation of methodology employed, and provides information obtained while recording the early aging of the Dusky Flycatcher, the Carolina...
This publication is is the result of a Fish and Wildlife Countermeasures Coordination Project undertaken by the U.S. Fish and Wildlife Service (USFWS). The goals of the project include the development of national “best practices” using...
