"Just as we are learning about these exciting new complex tool behaviours, the chimps that are showing us these behaviours are under danger from logging, poaching and Ebola, " she explained.

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Provincial authorities in Sichuan, on the upper reaches of the Yangzi, have already banned logging in primal forests under their jurisdiction.

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Logging on to sites such as Twitter while they are under attack only makes the situation worse because it adds to the overloading of the system, he said.

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Under the Ninth Circuit ruling, a permit could be demanded for every drain and ditch that directs water from a logging road to a fish-bearing stream.

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