“The dull brown Sparrows build nests of grasses set in a low bush or between its roots, but the flaming Oriole weaves himself a snug hammock high out on a swaying elm bough, and the Scarlet Tanager builds high in an oak. The Blue Jay weaves small roots into a firm nest set well above reach, while the Bluebird lines a hollow in a tree or takes an abandoned Woodpecker’s hole for his house. The Woodpeckers chisel out homes in tree-trunks, and Robins and Cliff and Barn Swallows use more or less mud, and plaster the inside of their homes. If you watch carefully now when the birds are building, and associate the various nests with the birds that build them, in autumn, when the young have flown, you can collect many of these nests and study their beautiful workmanship. But pray keep your hands off them while they are in use, for it is not being either kind or polite to meddle. “How do you think your mother would feel if somebody climbed in at the window and tumbled up your baby brother’s crib, perhaps spilling him out on the floor, or at least frightening him badly, in order to find out if he slept on a mattress or a feather bed, or if the crib itself was made of wood or metal? “At the time of the spring migration the birds that have been living in flocks all winter put on fresh feathers, and court and separate into pairs just as people do when they marry and begin housekeeping. Naturally they feel very happy, and have a great deal to say to each other, and this is what makes birds break into song when the spring comes to give them new life. “Though some few females can sing, it is the males who make the beautiful music that we hear in the spring mornings. The female is too busy with her housekeeping to do more than answer, but her husband’s song cheers her while she is brooding, and he probably tells her how pretty her new feathers are, and how much he loves her, too. “Among our gayly coloured birds, unlike people, it is the male who wears the brightest clothes. You have heard of this all through our fall and winter lessons, and you have seen the difference in pictures; now that the birds themselves have come, you will have a chance to see how well you remember, and if you can name the birds as they fly. The Scarlet Tanager and the Goldfinch both have plain greenish olive-coloured wives. The female Blue Jay is of a less bright hue than her mate, and the mate of the Rose-breasted Grosbeak wears a buff, brownish streaked vest. “Why? Because, as the mother bird spends more time about the nest than the father, if she wore bright clothes she would attract too much attention, and cruel Hawks, squirrels, and thieving people would find it too easily; and Nature’s first thought is always of the care and protection of young life, whether of plant, bird, or beast.