High up on some beam, too high for the children to reach, let us hope, a pair of barn swallows will plaster their mud cradle. Did you ever see them gathering pellets of wet soil in their bills at some roadside puddle? It is, perhaps, the only time you can ever catch them with their feet on the earth. Each mud pill must be carried to the barn and fastened on to the rafter. Countless trips are made to the puddle before a sufficient number of pellets are worked into the deep mud walls of the ample nursery. Usually grass is mixed with the mud, but some swallows make their bricks without straw. A lining of fine hay and plenty of feathers from the chicken yard seem to be essential for their comfort, which is a pity, because almost always chicken feathers are infested with lice, and lice kill more young birds than we like to think about. When there is a nestful of fledglings to feed, sticky little pellets of insects, caught on the wing, are carried to them by both parents from daylight to dusk. Do notice how tirelessly they work! In a family famous for graceful, rapid flight, the barn swallow easily excels all his relations. The deep fork in his tail enables him to steer {100} himself with those marvellously quick, erratic turns, which make his course through the air resemble forked lightning. But with what exquisite grace he can also glide and skim across the water, fields and meadows without an apparent movement of the wing! His flight seems the very poetry of motion. The ease of it accounts for the very wide distribution of barn swallows from southern Brazil in winter to Greenland and Alaska in summer. What a journey to take twice a year! THE EAVE OR CLIFF SWALLOW More than any other bird family, the swallows are becoming increasingly dependent for shelter upon man, at least when they are nesting; and as this is the season when they are most valuable to him because of the enormous numbers of insects they prevent from multiplying, let us hope that familiarity with us will never breed contempt and cause them to return to their old, uncivilised building sites. In the sparsely settled West, the cliff swallow still fastens its queer, gourd-shaped, mud nest against projecting rocks, but in the East it is so quick to take advantage of the eaves of the barns and other out-buildings, that its old name does not apply, and we know it here only as an eave swallow. {101} The barn swallow, as we have seen, chooses to nest upon the rafters inside the barn, but the eave swallow is content to stay outside under the shelter of a projecting roof. In such a place you find not one, but several or many mud tenements plastered in a row against the wall, for eave swallows are always remarkably sociable, even at the nesting season. A photograph of a colony I have seen shows one hundred and fifteen nests nearly all of which touch one another.