How many days does the crow hatch for eggs

The crow's eggs need 18 days.The breeding time of this bird is from April to July. When breeding, it is generally built first, and the nests are built in the woods.Its nest is composed of many materials. Common ones are dead branches, brusch, fine roots, and moss, which will be matched with feathers.It will breed a nest a year. There are usually 5-8 eggs in a nest. There are only 3 times when there are few, but there are more than 10 times.