Males are slightly bigger than females. When ready to leave its nest, a squab can sometimes weigh more than its parents. 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.