北美歌雀在切换到另一种类型之前，会一声一声地重复其中的一种，与之不同的是，北美歌雀会连续地创作更长的、更多变的歌曲，而不会重复。
Unlike the song sparrow, 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.
我们在一些歌雀的领地重复了这种实验。
We repeated this experiment in a number of song sparrow territories.
一种常见的北美雀鸟(歌雀)，长有条纹状、褐色的羽毛，以其宛转动听的歌声著称。
A common North American sparrow (Melospiza melodia) having streaked brownish plumage and noted for its melodious song.
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