African black swift

Distinctive features

The African black swift is 16–18 cm long and bulky like a pallid swift; it appears entirely blackish-brown except for a small white or pale grey patch on the chin which is not visible from a distance. It has a short forked tail and very long swept-back wings that resemble a crescent or a boomerang. This species is very similar to the common swift but can be distinguished under optimum viewing conditions by the contrast between its black back and paler secondary wing feathers. The heavier build also gives it a distinctive flight action, which consisted of a steady level flight interspersed with short glides.

Habitat

The breeding habitat is damp mountains, typically between 1600 and 2400 m, and less often at lower altitudes. This species feeds readily over lowland, and can form very large flocks, often with other gregarious swifts.

Movements

The nominate South African subspecies is migratory, wintering further north. Other subspecies are resident. Of the other seven accepted forms, the most widespread is the small and dark A. b. subsp. roehli of east Africa.

Two other dark races, A. b. balstoni and A. b. mayottensis (see: Malagasy black swift), are restricted to Madagascar and the Comoro Islands respectively. It has been suggested that some balstoni migrate to the continental mainland when not breeding, but this has not been proved.

Nesting

East African birds nest in hollow trees, whereas in South Africa this species uses cliffs, usually inland but also on the coast. The African black swift is a colonial breeder, sometimes forming mixed colonies with alpine swifts. The nest is a shallow grass cup glued to the substrate with saliva, and the typical clutch is one or two eggs.

Call

The call is a strident double-rasped, hissing scream zzzzzzzZZZTT, dissimilar to that of its confusion species.

References

Sources

• Sinclair, Hockey and Tarboton, SASOL Birds of Southern Africa,

References

1. BirdLife International. (2018). "''Apus barbatus''".
2. (2000). "A Guide to the Swifts and Tree Swifts of the World". Pica Press.
3. "African Black Swift".