Mating blackbirds will defend their territory against intruders.
乌鸫交配时会保护自己的地盘，不允许外来者侵入。
Never before captured on film, we witness majestic sliding, an epic fight for toboggan territory and the unique mating ritual of this rare icon of the Canadian Prairie.
观众将首次目睹以往从未被影片记录的壮观的滑行，为雪橇领土而发起的浩大战争和加拿大草原上具有象征性的独特婚恋典礼。
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