Drones can watch secretly on populations of animals in the wild, especially endangered ones.

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。

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The newspaper said wild pandas live 15 years on average, with captive ones typically living around 22 years.

报纸说道，野生熊猫平均生存时间是15年，圈养的熊猫一般生存时间大约是22年。

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Why This works: Many plants - including the ones listed - give off a strong scent to repel ants and other insects in the wild, and it works just as well in your home.

为何如此：许多的植物——包括我上面列的单子——可以发出强烈的令蚂蚁和其它野外的昆虫害怕的气味，这样可以击退它们，不过对你的家庭却无害。

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"These large, charismatic species are ... the ones that require the largest amount of wild habitat, and by preserving them we save the less impressive species too, " said Klenzendorf.

CNN: Beauty trumps beast in conservation efforts

Ones that had been caught in the wild often had skin ulcers and were infested by parasites.

WSJ: The Whale Doc Who Kept Sea World Healthy

There are about 4, 000 wild elephants in the country and a smaller number of domesticated ones used in sacred roles in Buddhist and Hindu temples.

BBC: Sri Lanka wildlife groups boycott elephant census