A dove is a kind of bird in the pigeon family, Columbidae. The names pigeon and dove are often used both for the same meaning. However, there is a small difference. Doves have a smaller body, and they have longer tails. Sometimes, though, there can be exceptions. The domestic pigeon is frequently called the "rock dove". This bird is called the "dove of peace." Pigeons and doves both have thick bodies and short necks with short, narrow bills. They live in lots of places, but most of them are in places such as Indonesia and Australia. The young doves and pigeons are called "squabs." There are more than 300 species of doves. The nests of doves are usually made of sticks. Their two white eggs are incubated by both the male and the female parent. Doves feed on seeds, fruit and plants. Unlike most other birds, the doves and pigeons produce a type of milk. Both sexes have this kind of highly nutritious milk to feed to the young.