The Gargling Chickadees

All chickadee species give “chick-a-dee” calls, but only three of them — Black-capped, Carolina, and Mountain — have whistled songs. An often-overlooked chickadee vocalization called the gargle may actually fulfill more of the traditional “song” functions than the whistled songs. [Read more]

Splitting Mountain Chickadee

The AOU’s North American Checklist Committee has posted a set of proposals currently under consideration. The biggest surprise is a proposed split of Mountain Chickadee into two new species, partly on the basis of vocalizations — but I’m rather skeptical of the reported differences. [Read more]