分布区域
外部特征
上身黑褐色,腰部有淡色腰斑,下身灰褐色。
习性
此鸟终日沿着海岸、岛屿飞行捕食飞虫,几乎很少休息。飞行时不似家燕那样作急剧转折,这是因为它的尾羽不呈叉状的缘故。繁殖期在4~6月,每窝产两枚卵。它的巢为半透明塑胶碟状,通常筑于崖隙或岩洞中,采制为名贵食品燕窝。
参考文献
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