Pigeons are monogamous and will lay one to two eggs which hatch within eighteen days. Young are fed "pigeon milk" which is regurgitated food from both males and females. While mating occurs year round, the peak mating seasons are spring and fall.

Twenty one species inhabit the United States. These birds are federally protected and cannot be destroyed.

Starlings were introduced intentionally in New York over a hundred years ago. Since then, they have spread in population and area. These birds may produce two clutches of offspring per year, each with four to seven offspring.