They also nest and roost on the support structures under bridges in cities and along highways. Pigeons build their nests with small twigs. A cock brings the nesting material to his mate, one piece at a time, and she builds the nest. Nests are usually well-hidden and hard to find. Eggs take about 18 days to hatch.
Pigeons also have colorful neck feathers.
Adult males and females look alike, but a male's hackle is more iridescent than a female's. So, when you see white on pigeons you are actually seeing no color. Pigeons that are all white are usually albinos. Pigeons have many types of feathers including contour feathers, the stiff feathers that give the body its shape, and down, the fluffy insulating feathers. Many pigeon feathers are accompanied by one or two filoplume feathers, which look like hairs.