Cassin's Vireo Vireo cassinii
Rare to Uncommon spring migrant, April through May, in all terrestrial regions. Rare fall migrant, September through November, primarily in Coastal and Mountains regions. Rare summer resident in the Mountains.
Habitat: Oak and conifer woodlands above 4000 feet elevation for breeding.
Best locations: Agua Dulce Creek, Doane Pond at Palomar mountain State Park.