Description
产卵、孵化是鸟儿繁殖后代的方式。因为鸟类的体重较轻，所以不能让雏鸟在体内发育成熟。只能在出壳后继续抚育。这是大自然的最佳选择。鸟卵一般分为卵壳、卵壳膜、卵白、气室、系带、卵黄膜、卵黄以及胚盘。其中，卵黄、卵黄膜以及胚盘是鸟卵的卵细胞，其余部分则是非细胞结构。卵黄是卵细胞主要的营养物质，供胚胎发育。胚盘是卵黄中央盘状的小白点，里面含有细胞核。卵黄膜紧包在卵黄外面，起保护卵黄的作用。
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