The Pygmy falcon is the smallest bird of prey in Africa (19-20 cm). It is also different in some other respects: the appearance is characterized by the red eye ring and the uniform grey color of the head and wings - a color cover that in the female is broken by a brown field on the back. (This is obvious in this picture). The Pygmy falcon is divided in two subspecies and two areas in Africa: the subspecies 'semitorquatus' can be found from Angola to northern South Africa. The subspecies 'castanonotus' is distributed from South Sudan to Somalia and south to Uganda and Tanzania. In Kenya, the Pygmy falcon usually uses old nests of White-headed buffalo weaver (Dinemellia dinemelli). Interestingly, in southern Africa, it often chooses the Social weaver's (Philetairus socius) enormous nest - where the two species live in some kind of symbiosis - this despite the fact that the Pygmy falcon is a predator and this species' nestlings are included in its diet. During cold times, the Pygmy falcon even takes advantage of the heat of the giant nests. It is even alleged that the two distribution areas of the Pygmy falcon coincide with those of the two weavers in question, because of this.