在研究灭绝的动物时，总要做一些猜测。
There's always some guesswork when studying extinct animals.
除了写了另一本书《回家的漫漫旅程》——讲述关于他与罗文一起前往非洲、澳大利亚和美国亚利桑那州的故事之外，鲁珀特还制作了纪录片《濒危动物》，由罗文担任主持人，讲述了那些濒临灭绝的动物。
Besides writing another book, The Long Ride Home, about travelling with Rowan to Africa, Australia and Arizona in the US, Rupert has also produced the documentary Endangerous, with Rowan as host, about dangerous animals that are endangered.
无人机可以秘密观察野生动物的数量，特别是濒临灭绝的动物。
Drones can watch secretly on populations of animals in the wild, especially endangered ones.
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