father and mother blue jay spend all their time in marketing, and they are not content with seeds and berries. they visit the nests of their bird neighbors, and then something very sad happens. when the blue jays go to a nest there may be four eggs in it; but when they go away there will not be any left, nothing but pieces of broken egg-shell. it is very, very sad, but this is another of the things which will always be so, and all that the other birds can do is to watch and drive the jays away.