同学们是否注意过,几乎所有的鸟产下的蛋表面都是近似椭圆形的,就连6500万年前灭绝的恐龙的蛋也是椭球体的。为什么鸟蛋表面是椭圆形的而不是圆形的呢?这与鸟类产蛋的过程有一定的关系。原来,鸟蛋在产出前确实是圆球体的,其表面柔软而有弹性,在出生时,鸟卵要经过产道一点一点地挤压出来,鸟类的产道会缓缓胀大,随着卵的产出,产道又一点点地收缩, The students have noticed that almost all the eggs produced by birds are nearly oval in shape, even eggs of dinosaurs extinct 65 million years ago are ellipsoid. Why egg surface is oval rather than round it? This is the process of egg production and birds have a certain relationship. It turned out that eggs in the production is indeed before the spheroid, the surface of soft and flexible, at birth, the eggs to squeeze out through the birth canal a little bit, the bird’s birth canal will slowly swell, with The output of eggs, birth canal and a little bit of contraction,