Lack, however, suggested that clutch size—the number of eggs a bird lays per breeding cycle—is far below the potential limit of egg production.

然而，缺乏情况表明卵的大小——每一个繁殖周期下的蛋的数量——远低于产蛋的潜在限制。

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youdao

Bird evolved from reptiles, so the first bird must have come out of an egg — laid by a reptile.

禽类是由爬虫类进化而来，所以，第一只禽鸟肯定是从爬虫类孵化的蛋里出来的。

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In fact, a single elephant bird egg is about the equivalent of 120 normal chicken eggs.

CNN: Apparently This Matters: Giant elephant bird egg

There's no saying who might ultimately bid on this elephant bird egg, but, clearly, it takes an eccentric -- someone prone to spending money on things that don't serve a greater purpose beyond just being weird for the sake of weird.

CNN: Apparently This Matters: Giant elephant bird egg

In south Wales, staff at Cwmcarn Forest Visitor Centre near Newport can already boast one new egg by their rare bird.

BBC: Monty the osprey