Adelaide's Warbler

Adelaide's warbler is 12.5 cm (4.9 in) long. Adult males have a slate-gray crown with a thin black stripe below it, a wide yellow supercilium that becomes thin and white behind the eye, a thin gray line through the eye, a white arc below the eye, gray ear coverts. Their upperparts are slate-gray. Their wings are mostly dull black or dusky with slate-gray edges on the flight feathers and white tips on the greater and median upperwing coverts that show as two wing bars. Their tail is dull black or dusky with white ends on the inner webs of the outer three pairs of tail feathers. Voice: Adelaide's warblers sing a "loud trill variable in pitch and speed". Individuals may have more than 20 variations. The species' calls include a quiet high-pitched pip, bursts of a loud harsh chit, and a chip.