Black buffalo weaver
The black buffalo weaver with a length of 24 cm and a weight of 65 g belongs to the largest representatives of weavers. The plumage is black, the beak is red, the eyes are brown, and the legs are reddish brown.
Birds feed on seeds, insects and fruits.
Eagles, marabou, and snakes are natural enemies of birds. First of all, chicks are in danger during the nesting period. The cramped, pipe-shaped inlets on the underside of the tree-topped common nest make it difficult for enemies to access.
Clutch consists of 3 - 4 eggs.
Birds build common nests, divided into separate nesting chambers. One nest is sometimes inhabited by several hundred birds. Constructed exclusively by males, dwellings of dry grass and brushwood can reach about 3 m in height and about 4.50 m in width. It happens that trees collapse under the weight of such a huge nest. The nest has been in use for several years and has been continuously expanded and repaired.
Both sexes have a genital opening, which they squeeze during mating. In addition, the male has, along with the genital opening, a phallic organ of connective tissue, which, however, does not serve for the transfer of spermatozoa.During a relatively long mating process of about 30 minutes, the male rubs this pseudophallus on the female's genitals for so long until ejaculation occurs from the genital opening. At the same time, the whole body shakes and shudders, which indicates that the male has experienced an intense orgasm.
Birds have both a male and a female, respectively, several sexual partners. In many promiscuous bird species, the female is able, after copulation, to release sperm again and thus give the next applicant the opportunity to fertilize herself, giving him preference. Stimulation of the female's genitals presumably influences this preference and the associated natural selection.