In this issue, Peter Pyle offers a revised subspecies taxonomy that is 70 years in the making. Asher Gorbet and Jason Kitting explain a new system for categorizing bird molt. Morgan Tingley and Ben Tonelli talk about the role of geomagnetism in bird vagrancy. And more! The post North American Birds: Vol. 76, No. 21 appeared first on American Birding Association.
