Opportunists must constantly invade new areas to compensate for being displaced by more competitive species.

“机会主义者”必须不断入侵新的地区，以弥补被更具竞争力的物种取代的损失。

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Commenting on the find, snake expert Robert Henderson, from the Milwaukee Museum of Natural History, said, "Worldwide, new species of frogs are being discovered and described quite regularly."

密尔沃基自然历史博物馆的蛇类专家罗伯特·亨德森对这个发现评价称：“在世界范围内，人们经常会发现和描述新种类的青蛙。”

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Snake expert Robert Henderson, from the Milwaukee Museum of Natural History, said, "Worldwide, new species of frogs are being discovered and described quite regularly."

密尔沃基自然历史博物馆的蛇类专家罗伯特·亨德森说：“在世界范围内，人们经常发现和描述新的青蛙种类。”

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At the same time, community plantations with fast-growing tree species for use as fuelwood are being introduced, as well as 10 000 efficient wood-burning stoves.

UNESCO: The lucrative business of saving East African forests

Take the question of whether we are the only species to care about the well-being of others.

WSJ: The Brains of the Animal Kingdom

Governments, he said, were no longer seeing these species issues as being about biodiversity - they were seen as threats to national security.

BBC: Conservation meeting decisions hanging in the balance