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 is a booklet that describes various migratory birds that are familiar in the United States. The species covered include the American robin, the American goldfinch, the Ruby-throated hummingbird, the eastern bluebird, the barn swallow, the gray...
