How can the pigeon step on the back a few seconds

The pigeon's back time is not fixed. It only takes more than ten seconds, and it takes a minute.When this bird grows up to 6 months, it can be reproduced. It breeds about 8 times a year. Two eggs will be produced each time. After the incubation of 18-19 days, the young pigeons will break out of the shell.After that, the pro -bird will secrete pigeon milk and use it to nurture the pigeon.On the fourth day after the shell, the young pigeons can open their eyes, but after two months of nurturing, they can leave the nest.