Western Bird Guide: Birds of the Rockies and West to the Pacific

by Charles K. Reed

CASSIN VIREO.

629a. Lanivireo solitarius cassini. 5 inches.

To be found west of the Rockies from British Columbia south to Lower California and Mexico. In southern California, it is found breeding much more commonly than the [Western Warbling Vireo], placing its nest high in the oaks and coniferous trees. It belongs to the same musical family, keeping up its song from morning until night. The nest is made of similar material to the previous, and the eggs are the same, except in size (.75 × .58).