Pigeons are really rock doves that were introduced from Europe by early settlers. They are now widespread and common across North America. Building ledges, rafters, and eaves are typical nesting sites for pigeons. The pair builds a rather messy nest in which the female lays one or two eggs. The incubation period is 17 to 19 days. The young are fed predigested food until they are weaned and leave the nest at 35 to 37 days of age.