Nashville Warbler
Leiothlypis ruficapilla
The Nashville warbler is a small warbler. Both male and female Nashville warblers have a gray head fading into a greenish back and wings, a white belly and a yellow throat and breast. They have a complete white eye ring, no wing bars, and a thin pointed black bill. Adult males have a rusty brown patch on their crown, which is usually hard to see and often covered by gray feathers. Males will raise it slightly when agitated. Females and immature birds have a duller olive-grey head, and less bold yellow on their throat. Voice: The song of the nominate eastern subspecies consists of a rapid seewit-seewit-seewit-ti-ti-ti. Males sing from open perches on the nesting territory. The call sounds like a high seet. Western birds of the race ridgwayi have a slightly lower-pitched, richer song, and a sharper call note.
ID text from Wikipedia, CC BY-SA 4.0
Orange-crowned Warbler
Leiothlypis celata
The orange-crowned warbler has olive-grey upperparts, yellowish underparts with faint streaking and a thin pointed bill. It has a faint line over each eye and a faint broken eye ring. The orange patch on the crown is usually not visible. Females and immatures are duller in colour than males. Western birds are yellower than eastern birds.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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