Aerial diving display, with calling, by black falcon falco subniger

摘要

This note describes a variant of high-aerial agility display-flight, with calling, by a solitary Black Falcon Falco subniger. The soaring Falcon repeatedly dived and ascended, with rapid wing-beats, in an oblique figure-8 pattern, in apparent advertisement. The display was observed in the non-breeding season, in an area where no previous breeding has been recorded. The Black Falcon-s aerial displays are similar to those of the Peregrine Falcon F. peregrinus, and particularly to those of the 'great- or 'desert- falcons (subgenus Hierofalco).