The pigeon laid a nest of eggs.

Pigeons are very alert. If their nests are destroyed, they can never go back. So your friend's pigeon probably can't go back.

Once an egg begins to hatch, it must continue. If the pigeon doesn't come back, it is estimated that it will die.

It is suggested to throw away the pigeon food next to the eggs and see if the pigeons can go back for the third time.