Semper's Warbler

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.

Semper's warbler is endemic to Saint Lucia, living in the undisturbed undergrowth of lower montane rainforests and elfin woodlands. Most records of the species come from the Barre de l'Isle ridge, between Piton Flore and Piton Canaries.

There is next to no information about the ecology of the Semper's warbler. Most if not all of its foraging activity took place in forest understory, generally close to the ground. It may nest on or near the ground.