How Fast Is That Vireo Singing?

I can still remember the first time I heard a vireo “complex song”. I was taken completely by surprise, not even knowing Plumbeous Vireos had it in them to sing so awesomely. [Read more]

“Least” Bell’s Vireo

Recently, Elisabeth Ammon of the Great Basin Bird Observatory asked me for help in determining whether there are any vocal differences between the endangered “Least” Bell’s Vireo and the subspecies arizonae. [Read more]