One spring day when the ground is a carpet of green, a pair of bluebirds arrives at their summer home. Inside their nest box the female weaves layers of coarse grass into a circle. Then she presses her body into the middle to make a cup. A season in the life of a bluebird family In a cozy nest of grass a female bluebird lays her eggs, blue as the summer sky. When they hatch, there are four tiny chicks to feed. From morning to night, the parent birds...