Of the red-breasted marsh-bird (_Leistes superciliaris_) Hudson (_Argentine Ornithology_, vol. i, p. 100) writes: "These birds are migratory, and appear everywhere in the eastern part of the Argentine country early in October, arriving singly, after which each male takes up a position in a field or open space abounding with coarse grass and herbage, where he spends most of his time perched on the summit of a tall stalk or weed, his glowing crimson bosom showing at a distance like some splendid flower above the herbage. At intervals of two or three minutes he soars vertically up to a height of twenty or twenty-five yards to utter his song, composed of a single long, powerful and rather musical note, ending with an attempt at a flourish, during which the bird flutters and turns about in the air; then, as if discouraged at his failure, he drops down, emitting harsh, guttural chirps, to resume his stand. Meanwhile the female is invisible, keeping closely concealed under the long grass. But at length, attracted perhaps by the bright bosom and aërial music of the male, she occasionally exhibits herself for a few moments, starting up with a wild zigzag flight, and, darting this way and that, presently drops into the grass once more. The moment she appears above the grass the male gives chase, and they vanish from sight together." "Courtship with the mallard," says J.G. Millais (_Natural History of British Ducks_, p. 6), "appears to be carried on by both sexes, though generally three or four drakes are seen showing themselves off to attract the attention of a single duck. Swimming round her, in a coy and semi-self-conscious manner, they now and again all stop quite still, nod, bow, and throw their necks out in token of their admiration and their desire of a favorable response. But the most interesting display is when all the drakes simultaneously stand up in the water and rapidly pass their bills down their breasts, uttering at the same time a low single note somewhat like the first half of the call that teal and pintail make when 'showing off.' At other times the love-making of the drake seems to be rather passive than active. While graciously allowing himself to be courted, he holds his head high with conscious pride, and accepts as a matter of course any attention that may be paid to him. A proud bird is he when three or four ducks come swimming along beside and around him, uttering a curious guttural note, and at the same time dipping their bills in quick succession to right and left. He knows what that means, and carries himself with even greater dignity than before. In the end, however, he must give in. As a last appeal, one of his lady lovers may coyly lower herself in the water till only the top of her back, head, and neck is seen, and so