It was not previously known what ammonites fed on-and, in truth, this evidence applies only to the animal in question, a species of Baculites.

此前，鹦鹉螺的食性并不为人所知，事实样，这一证据只能证明一种存在疑问的物种- - -杆菊石的某一物种的食性。

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What ammonites-or, at least, some of them-ate became clear earlier this year when an X-ray showed a small crustacean in the jaws of a species called Baculites.

鹦鹉螺吃什么的问题今年有了答案，x光显示杆鹦鹉螺的咽喉中有小甲壳类动物的痕迹。

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