研究由英国和加拿大的科学家进行。 通过化石指骨长度，他们计算出已经灭绝的类人猴和人类祖先的睾丸激素水平。

The study was carried out by British and Canadian scientists who worked out the testosterone levels of extinct apes and ancestors by looking at the length of fossilised finger bones.

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这就表示，人类的易患病体制归咎于胎儿睾丸激素，但对于鸟类而言，却是由胎儿丝雌激素引起的。(或者说，是对雌激素的反应)。

This suggests that the sorts of predispositions that in people are blamed on fetal testosterone are caused in birds by fetal oestrogen (or, rather, the response to it).

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