- 5.1 in
- 7.1–8.7 in
- 0.4–0.5 oz
- Paruline du Kentucky (French)
- Chipe patilludo (Spanish)
- Unlike most songbirds, a male Kentucky Warbler appears to sing only one song type. He will sing the same one throughout his life. Although counter-singing males do not match each other's song types the way many bird species do, a male may match the pitch of a competitor's song.
May be declining slightly in much of range. This species is on the 2014 State of the Birds Watch List, which lists species most in danger of extinction without significant conservation action.
- McDonald, M. V. 1998. Kentucky Warbler (Oporornis formosus). In The Birds of North America, No. 324 (A. Poole and F. Gill, eds.). The Birds of North America, Inc., Philadelphia, PA.