这种方法可以精确地运用于所有灵长类。德西尔瓦有一打南猿头骨可供他分析。

That can be done very accurately for all primates, and DeSilva was able to analyze a dozen Australopithecus skulls.

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德西尔瓦说，即使存在着一定幅度的误差，结果还是很明显，南猿幼儿的出生重量更接近于现代人类，即占母体重量的6%，而不是类人猿的3%。

Even with that margin of error, DeSilva says, it was clear that the birth weight of Australopithecus infants was much closer to the 6 percent of modern humans than the 3 percent of apes.

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