Earbirding.com

In my last post, I discussed differences in the alarm calls of Gray Hawk (for the purposes of this post, Buteo plagiatus) and Gray-lined Hawk (here, Buteo nitidus). See that post for a discussion of taxonomic issues. In this post, I plan to add some information about alarm calls and also discuss the series calls of these two taxa. [Read more]

The Gray Hawk was historically considered two species. In recent years the AOU has recognized only a single species, but evidence is mounting that it should in fact recognize two. In this post I present added evidence for the split: substantial differences in voice between the “Gray” (plagiatus) and “Gray-lined” (nitidus) groups, a fact that seems to have gone unreported in the literature so far. [Read more]