Unlike the songsparrow, which repeats one of its several song types in bouts before switching to another, the warbler continuously composes much longer and more variable songs without repetition.
The faint silvery 1)warblings heard over the partially bare and moist fields from the 2)bluebird, the 3)songsparrow, and the 4)redwing, as if the last flakes of winter tinkled as they fell!
知更鸟、歌雀、红翼鸫在部分光秃而潮湿的田野里轻吟出银铃般的旋律，犹如冬天最后的雪花簌簌地飘向大地。
3
We repeated this experiment in a number of songsparrow territories.