All members of the dove and pigeon order belong to the same family. There are approximately 310 species of pigeons and doves. They are found all around the world, including many oceanic islands. You can recognize pigeons and doves by their small bills with bare skin at the base and a little bulge at the tip. They also have small heads on plump bodies with soft feathers. Pigeon parents feed their young a special milk made in their crops (part of their digestive system). Pigeons on city streets are also called Rock Doves .