What do you mean by two pigeons without stepping on your back?

Two pigeons kissed without stepping on the back and showed that they were not sexually mature.This kind of bird is sexually mature when it is 5 months old. In order to prevent the proximity pair of degeneration, the pigeon pairing with a long blood relationship is often familiar with for a while before pairing.It will give birth to eggs for many days.Each egg will produce two, male and female birds will hatch, and will hatch after more than ten days.