Red-billed quelea

The red-billed quelea (Quelea quelea) is a small, sparrow-like bird from sub-Saharan Africa. It belongs to the weaver family, known scientifically as Ploceidae. This species is famous for its incredible population size. Scientists believe it is the most numerous undomesticated bird on Earth. At certain times, the total post-breeding population can peak at an estimated 1.5 billion individuals. Because they move in massive groups to find food, they are a vital part of the African ecosystem.

These birds follow a nomadic lifestyle to survive. They primarily eat the seeds of annual grasses. When food supplies run low, the birds move to locations where there has been recent rainfall. This movement allows them to exploit fresh grass seeds very efficiently. They often travel in enormous flocks containing millions of birds. When birds at the rear of a flock run out of food, they fly over the entire group to reach the fresh feeding zone at the front. This movement creates a visual effect similar to a rolling cloud moving across the landscape.

Red-billed queleas have distinct physical appearances depending on the season. During the non-breeding season, males and females look quite similar. They have light underparts, striped brown upper parts, and reddish bills. However, their appearance changes significantly during the breeding season. Breeding males often develop a black facial mask. This mask covers the forehead, cheeks, and parts of the throat. It is often surrounded by a colorful wash of purple, pink, rusty, or yellowish tones. Breeding females may develop a yellowish bill during this time.

There are three recognized subspecies of the red-billed quelea. The first is Quelea quelea quelea, which lives from Senegal to Chad. The second is Q. q. aethiopica, found from Sudan to Somalia and Tanzania. The third is Q. q. lathamii, which ranges from Gabon to South Africa. These subspecies are often distinguished by the specific color patterns in the male breeding plumage. For example, the mask on Q. q. aethiopica does not extend as far above the bill as it does in other subspecies. Because these birds can interbreed, birds with intermediate features can sometimes be found where their ranges overlap.

Humans have been studying the quelea for centuries. Carl Linnaeus first described the bird in 1758 in his work, Systema Naturae. He originally classified it as a bunting and incorrectly thought it originated in India. This mistake likely happened because ships from the East Indies picked up birds while visiting Africa. Later, in 1850, Ludwig Reichenbach assigned the bird to the new genus Quelea. He recognized that the bird was actually a member of the weaver family. Other scientists, such as Andrew Smith and Carl Jakob Sundevall, also contributed to describing the different subspecies.

The bird's massive numbers can cause challenges for agriculture. Because they feed heavily on cereal crops, they are sometimes called "Africa's feathered locust." This nickname refers to the extensive damage they can cause to farms. To manage these populations, some people use avicides or detonating fire-bombs in large colonies at night. However, these extensive control measures have largely been unsuccessful at limiting the population. Despite being a pest to some, the species is currently listed as "least concern" on the IUCN Red List.

Beyond their feeding habits, the quelea has a complex biological history. Recent DNA analysis shows that the red-billed quelea is the sister group to a clade containing the cardinal quelea and the red-headed quelea. They are most closely related to the fodies, a genus of birds found on islands in the western Indian Ocean. The birds also show interesting nesting behaviors. They construct oval, roofed nests using strips of grass. These nests are often woven into thorny branches, reeds, or sugar cane to provide protection.