Apus sladeniae

Apus sladeniae, also known as Fernando Po Swift or Martinet de Fernando Po, was once a subspecies of the African black Swift. The population size of this species has not been quantified; We only know from 10 records. Reason for trend: Population trends are unknown because the species is only known from very few records and little is known about its ecology.

Listed on the IUCN Red List of Threatened Species (IUCN)2016 ver3.1 - Data deficient (DD).

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The body length is 16-18 cm, the body size is huge, like the pale swift; The body feathers appear entirely dark brown, except for a small white or light gray spot on the chin that is not visible from a distance. They have a short forked tail and very long swept wings, similar to crescents or boomerangs. The species is very similar to the common louver, but can be distinguished under optimal viewing conditions by the contrast between its black back and lighter secondary wing feathers. Their heavier bodies also give them unique flight maneuvers, which include steady horizontal flight and short gliding distances.

Breeding place: Cameroon;
Uncertainties exist: Angola and Equatorial Guinea;
Wandering: Nigeria.