Semper's warbler

Semper's warbler (Leucopeza semperi), local name pied-blanc, is a possibly extinct passerine bird of the New World warbler family, Parulidae. It is endemic to Saint Lucia, in the Lesser Antilles. It is the only species in the genus Leucopeza.

Semper's warbler is about 14.5 centimetres (5.7 inches) in length. It has a dark gray head with a pale superciliary, dark gray upperparts, a grayish-white belly, and brown wings and tail, with a grayish olive-brown wash on its flanks. Its dark gray bill is long and pointed. First-year birds are brownish-gray above, with pale buffish brown underparts and a whiter throat. The long legs are pale white to yellow in coloration. Juveniles remain undescribed.

The song remains undescribed. The only documented calls consist of tuck-tick-tick-tuck noises, as well as chattering sounds made when an individual is alarmed.