Both females will have laid a fertilisedegg and randomly shunted one aside (Biology Letters, vol 4, p 323).
这两只雌鸟会各自产下一枚受过精的卵，并且随机扔掉一枚（《生物通讯》，第4卷，第323页）。
2
A healthy egg carries 46 chromosomes - 23 pairs - but before it can be fertilised it needs to ditch 23 of these, which it packages into a structure called a polar body.
一个健康的受精卵有46个染色体(23对)，但在它能分化之前，它必须先分为23个一组，形成极体。
3
Mature breeding birds are very expensive - even a fertilised ostrich egg isn't cheap so you need quite a bit of capital to begin with.