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Remember the tooth 牙齿的痕迹 A link is made in an ancient ecosystem 古代生态系统中的线索 WHO ate whom in the food chains of the past is rarely clear. 在古代谁以吃谁为生是不清楚的。 Though it is obvious which species were predators and which prey, 尽管谁是捕食者和谁是猎物是很明显的, the subtle specialisations of feeding habit that allow many types of carnivore to co-exist arerarely preserved in the fossil record. 但是专门的微妙的捕食习惯,能让多种食肉动物能够共存的资料很少有保存完好的化石记录。 Rarely, but not never. 很少有记录不表示没有。 That is why the recent discovery of a Jurassic ammonite with a shark s tooth embedded inits shell has excited palaeontologists. 这就是为什么最近发现侏罗纪菊石，连同壳上面的鲨鱼牙齿让古生物学家非常兴奋。 The ammonite in question, Orthaspidoceras, a species that thrived 155m years ago, 发现的鹦鹉螺是一种叫Orthaspidoceras的生活在一亿五千五百万年前的生物， was part of the collection of an amateur who did not realise the significance of what he hadfound. | 
