High Quality Content by WIKIPEDIA articles! The Black-capped Gnatcatcher, Polioptila nigriceps, is a very small songbird. Adults are blue-grey on the upperparts with white underparts, with a long slender bill and a long black tail with white outer tailbands on the uppertail. The undertail is extensively white, showing black only along a thin vertical center line and at the very tip. Males show a prominent black cap. This species is very similar to the California Gnatcatcher and the Black-tailed Gnatcatcher.

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