The white-tailed sabrewing (Campylopterus ensipennis) is a Near Threatened species of hummingbird in the "emeralds", tribe Trochilini of subfamily Trochilinae.

Females are similar but the blue of their throat is smaller and duller and their underparts are pale gray with green spots on the flanks.

[5] The shafts of the outer flight feathers are thickened and flattened which gives the distinctive feature of the sabrewings their English and genus names.

In this case, both parts of the scientific name refer to this feature, Campylopterus and ensipennis being derived from the Greek and Latin respectively for "bent wing".

[5][6] The white-tailed sabrewing is found in two locations in Venezuela, the Cordillera de Caripe and the Paria Peninsula, and also on Tobago.

The male white-tailed sabrewing sings "a persistently given, comparatively loud and slightly bisyllabic 'tzchink'", typically from a perch within the forest and 2 to 6 m (7 to 20 ft) above the ground.