What's wrong with two pigeons stepped on each other?

It is normal for two pigeons to step on their backs.This kind of bird breeding needs to be paired first. After completing the pairing, the birds will start to nest. Most of the wild varieties are nests in the tree hole.EssenceUsually each nest can produce 4-8 eggs. After 18 days of incubation, the chicks will break out of the shell. After 25 days, it can live away from the nest.