Olive-Sided Flycatcher

On May 20, 2023 I was at Big Morongo Canyon Preserve in Morongo Valley, California and saw two olive-sided flycatchers, the only olive-side flycatchers I've seen. 

The first two photos are of one, identified on iNaturalist by one other identifier. 

Raised head feathers look like a crest. 

White mid-breast. This photo is of another, identified as such by two others identifiers on iNaturalist.

This illustration is from Birds of the World. 

It has gray-olive or gray-brown plumage above, a white-mid-breast section and throat. The side of the breast are gray and make it look lite it is wearing a vest. It can raise its head feathers which make it look like it has a small crest. 

Range from Birds of the World. 

It breeds from California and New Mexico up to central Alaska, then across Canada, except for most of the Northwest Territories and Nunavut,  and through portions of the northeastern U.S. Its non-breeding area  is in northern South America and a small area in Central America.