A Complete Collection of 100000 Whys
Fav十万个为什么
为什么燕子低飞要下雨？
简单的摘要：燕子低飞预示下雨的原因包括气压下降导致昆虫飞行高度降低、空气湿度增加使昆虫翅膀变重、燕子翅膀受潮加重以及捕食行为变化。
1、下雨前气压下降，昆虫的飞行高度降低，燕子为了捕食这些昆虫而低飞。
2、空气湿度增加，昆虫翅膀变重，无法高飞，只能在低空活动，燕子因此降低飞行高度捕食。
3、空气湿度和气压变化也会影响燕子的翅膀，使其变重，燕子只能低飞以保持平衡。
4、燕子通过低飞捕食低空活动的昆虫，这种捕食行为的变化与即将到来的降雨密切相关。
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