Red-billed Queleas are the most abundant wild bird species in the world, with an estimated adult breeding population of 1.5 billion pairs. They are confined to sub-saharan Africa. They live and breed in colonies which may cover 100 hectares and which attract a huge variety of predators (storks, raptors, owls, rollers, shrikes, grey hornbills, redbill woodhoopoes, corvids as well as snakes, rodents and carnivores).

http://en.wikipedia.org/wiki/Red-billed_Quelea