The eastern bluebird lays a light blue egg with brown speckles. Nests are commonly found in backyards, golf courses, agricultural fields and other areas with few trees and sparse ground cover.
Many birds that nest in trees lay blue or green eggs. The eastern bluebird is common in North America during the summer months and migrates south to Mexico in the winter. This bird produces more than one successful brood each year. Birds that live in the northern and western areas of their normal range typically lay more eggs than those who live in the eastern and southern areas. Only females of this species build nests and incubate eggs.