Warbling Vireo

The warbling vireo is olive-gray on the head and upperparts with white underparts; has brown eyes; a light face; white supercilium; thick blue-gray legs and a stout bill. Wikipedia treats the western and eastern warbling vireo as a single species and Birds of the World treats them as separate species. The western bird, which I saw at Big Morongo Canyon Preserve in Morongo Valley, California, is smaller and has a darker gray crown.  I posted it on iNaturalist and had one confirming identification. I am horrible at spotting small birds and even worse at photographing them, so this was a pretty successful photo for me. I have been working at getting better at small birds. 

Western Warbling Vireo 

Western Warbling Vireo illustration from Birds of the World.

Western Warbling Vireo range from Birds of the World.