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 document fulfills the requirements of Section 10 and 16 of the North American Wetlands Conservation Act of 1989. It is a biennial assessment of (A) the estimated number of acres of wetlands and habitat for waterfowl and other migratory birds...
This is a report on wetlands growth in the conterminous United States between 1998-2004. It offers information on growth only; wetland quality is not explored in this report.
