The reason why gray swallows do not hatch eggs

Most of the gray swallows do not hatch eggs because of poor motherhood, or it may have other scent on the egg.This bird will first look for a spouse during the breeding period, and then start building nests.It can breed 1-2 nests a year, with 3-5 eggs per nest. It will produce one a day. It will only be incubated after all after giving birth. This takes 14 days.After the chicks come out of the shell, the pro -bird will feed until it basically grows and can go out for food.