The results were published online in the journal Endangered Species Research.

这项研究结果已经发表在《濒危物种研究》杂志的网站上。

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While studying endangered species may provide some insights to scientists, the cost of keeping these animals in existence can not be justified for research purposes alone.

虽然研究濒危物种可能为科学家提供一些领悟，但仅仅为了研究的目的而饲养这些动物的话，其饲养成本是不合理的。

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However, chimpanzees are highly endangered species, and size large, easy on the breeding and fed, expensive and difficult as the animal model for AIDS Research.

然而，黑猩猩是高度濒危物种，而且体型巨大，不易于繁殖和豢养，费用昂贵，难以作为艾滋病研究动物模型。

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Earthwatch ( www.earthwatch.org) takes paying volunteers along on a wide variety of academic research expeditions, many of which include projects studying endangered species.

CNN: ASIANOW - TIME Asia | Travel Watch

Supporters tout the valuable research and conservation efforts of zoos, which work with endangered species and serve as more than just a place to see the monkeys on a Sunday afternoon.

BBC: The dual sides of animal captivity

Some of the rest goes on energy research, but that still leaves plenty for pet causes, from endangered species to public transport.

ECONOMIST: Pollution law