The red-billed pigeon (Patagioenas flavirostris) is a relatively large, robust species of pigeon. Its breeding range extends from southern Texas, United States, to Costa Rica. It is primarily found throughout coastal and lowland areas of Mexico and Central America. It belongs to a clade of Patagioenas which generally lack iridescent display plumage, except some vestiges in the pale-vented pigeon.
Red-billed pigeons have largely dark, slate-gray plumage with a more maroon, though sometimes described as purple, head, neck, and wing coverts. They have pale red eyes with an orange orbital ring, along with a red bill with a yellow tip. Noticeably, they don't have iridescent collar plumage. A blue-gray belly and tail coverts, as well as a less brown back, distinguish it from most other species., such as the Ruddy Pigeon and Short-billed Pigeon. The only noticeable difference between males and females is that the females have a duller colored head and neck. Juveniles are often even more dull in color and have dark and dusky shoulders, as well as a more brown mantle and wings.
Compared to other birds, they are a more mid-to-large sized bird, growing to be between 30 and 37 cm (12-15 in.) in length and a weight of 230–425 g (8.1–15.0 oz).
Red-billed pigeons have a very distinctive call, described to be a long, high-pitched call consisting of a coooo followed by three cuk-c'-c'-coo notes. It follows an ascending sound. When taking off, the birds' wings create a noticeable clapping noise.
