The young of ground-nesting warblers produce begging cheeps of higher frequencies than do their tree-nesting relatives.
相比在树上筑巢的同种类雏鸟，在地面筑巢的鸣禽雏鸟会发出频率更高的乞食叫声。
World 1-1: A grassland level with many colored blocks. This level introduces Cheep-Cheeps, Goombas and the new Tanooki Goombas.
关卡1-1： 绿色草原坐落着许多彩色的方块，这一关主要是介绍飞鱼，栗子头和新的敌人——带狸猫尾巴的栗子头。
World 1-1: A grassland level with many colored blocks. This level introduces Cheep-Cheeps, Goombas and the new Tanooki Goombas.
关卡1-1： 绿色草原坐落着许多彩色的方块，这一关主要是介绍飞鱼，栗子头和新的敌人——带狸猫尾巴的栗子头。
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