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Columbidae is a bird family containing the pigeons and doves. It is the only family in the order Columbiformes. These are stout-bodied birds with short necks, and short slender bills that in some species feature fleshy ceres. They primarily feed on seeds, fruits, and plants. The family occurs worldwide, but the greatest variety is in the Indomalaya and Australasia ecozones. The family contains 344 species divided into 49 genera. Thirteen of the species are extinct.[2] In English, the smaller species tend to be called "dove" and the larger ones "pigeon".[3] The distinction is not consistent,[3] and does not exist in most other languages.[citation needed] Historically, the common names for these birds involve a great deal of variation between the terms. The bird most commonly referred to as just "pigeon" is the domestic pigeon, which is common in many cities as the feral pigeon. Pigeon is a French word that derives from the Latin pipio, for a "peeping" chick,[4] while dove is a Germanic word that refers to the bird's diving flight.[5] The English dialectal word "culver" appears to derive from Latin columba.[4] A group of doves is called a "dule," taken from the French word deuil (mourning). Doves and pigeons build relatively flimsy nests, often using sticks and other debris, which may be placed on trees, ledges, or the ground, depending on species. They lay one or two eggs at a time, and both parents care for the young, which leave the nest after 7–28 days.[7] Unlike most birds, both sexes of doves and pigeons produce "crop milk" to feed to their young, secreted by a sloughing of fluid-filled cells from the lining of the crop. Young doves and pigeons are called "squabs"