The advent of spring is usually announced during the first week of March, sometimes by the robins, sometimes by the bluebirds. The latter, it should be remarked, are an exception to the rule that our spring and autumn callers arrive and depart in the night. My impression is that their migrations are ordinarily accomplished by daylight. At all events I have often seen them enter the Common, alight for a few minutes, and then start off again; while I have never known them to settle down for a visit of two or three days, in the manner of most other species. This last peculiarity may be owing to the fact that the European sparrows treat them with even more than their customary measure of incivility, till the poor wayfarers have literally no rest for the soles of their feet. They breed by choice in just such miniature meeting-houses as our city fathers have provided so plentifully for their foreign _protégés_; and probably the latter, being aware of this, feel it necessary to discourage at the outset any idea which these blue-coated American interlopers may have begun to entertain of settling in Boston for the summer.
The robins may be said to be abundant with us for more than half the year; but they are especially numerous for a month or two early in the season. I have counted more than thirty feeding at once in the lower half of the parade ground, and at nightfall have seen forty at roost in one tree, with half as many more in the tree adjoining. They grow extremely noisy about sunset, filling the air with songs, cackles, and screams, till even the most stolid citizen pauses a moment to look up at the authors of so much clamor.
By the middle of March the song sparrows begin to appear, and for a month after this they furnish delightful music daily. I have heard them caroling with all cheerfulness in the midst of a driving snow-storm. The dear little optimists! They never doubt that the sun is on their side. Of necessity they go elsewhere to find nests for themselves, where they may lay their young; for they build on the ground, and a lawn which is mowed every two or three days would be quite out of the question.
At the best, a public park is not a favorable spot in which to study bird music. Species that spend the summer here, like the robin, the warbling vireo, the red-eyed vireo, the chipper, the goldfinch, and the Baltimore oriole, of course sing freely; but the much larger number which merely drop in upon us by the way are busy feeding during their brief sojourn, and besides are kept in a state of greater or less excitement by the frequent approach of passers-by. Nevertheless, I once heard a bobolink sing in our Garden (the only one I ever saw there), and once a brown thrush, although neither was sufficiently at home to do himself justice. The "Peabody" song of the white-throated sparrows is to be heard occasionally during both migrations. It is the more welcome in such a place, because, to my ears at least, it is one of the wildest of all bird notes; it is among the last to be heard at night in the White Mountain woods, as well as one of the last to die away beneath you as you climb the higher peaks. On the Crawford bridle path, for instance, I remember that the song of this bird and that of the gray-cheeked thrush[1] were heard all along the ridge from Mount Clinton to Mount Washington. The finest bird concert I ever attended in Boston was given on Monument Hill by a great chorus of fox-colored sparrows, one morning in April. A high wind had been blowing during the night, and the moment I entered the Common I discovered that there had been an extraordinary arrival of birds, of various species. The parade ground was full of snow-birds, while the hill was covered with fox-sparrows,--hundreds of them, I thought, and many of them in full song. It was a royal concert, but the audience, I am sorry to say, was small. It is unfortunate, in some aspects of the case, that birds have never learned that a _matinée_ ought to begin at two o'clock in the afternoon.