Cold as the day was (many degrees below freezing), I heard and saw bluebirds, and as we passed along, every sheltered tangle and overgrown field or lane swarmed with snowbirds and sparrows, --the latter mainly Canada or tree sparrows, with a sprinkling of the song, and, maybe, one or two other varieties. The birds are all social and gregarious in winter, and seem drawn together by common instinct. Where you find one, you will not only find others of the same kind, but also several different kinds.