Doves rest their heads between their shoulders when they sleep, and they primarily eat seeds and fruit rather than insects. They typically lay only two eggs at the time, and the eggs hatch in about two weeks. Both parents care for the babies, which leave the nest after seven to 28 days. Notably, doves mate for life.
Doves and pigeons belong to a group of birds that includes about 310 species. Doves and pigeons are often referred to interchangeably, but they vary greatly in size. Both types of birds build flimsy nests on the ground or in trees. Birds in the group comprising doves and pigeons do not have gall bladders, and their bile enters the gut directly.
Doves and pigeons live throughout the Earth, excluding a few inhospitable areas. They live in many types of habitats. Some of the birds have large ranges, while others remain in small areas. Human activity has proven beneficial to some species of these birds, which have increased their numbers and geographical ranges. However, many other species have become threatened, and a few have become extinct. The dodo and passenger pigeon are among the 10 species to become extinct since 1600. The mourning dove is closely related to the extinct passenger pigeon.