Why does the speaker choose that amphibian as her representative of a public creature?

为什么那位演讲者要选择这种两栖动物作为公众生物的代表呢？

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Some 25 percent of all known amphibian species were discovered only over the last ten years, a period when their Numbers worldwide have been in desperate decline.

过去十年科学家发现了25%的两栖动物物种，与此同时，两栖动物数量在世界范围内却急剧下降。

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The olms studied by Voituron’s team are part of a population established 48 years ago to help conserve the rare amphibian, which is found in caves in Croatia and Slovenia.

48年前为了保护稀有的两栖物种，洞螈作为其中一种被人们保护了起来，当时是在克罗地亚和斯洛文尼亚的山洞里面找到了它们，这些洞螈中的一部分正是Voituron研究小组的研究对象。

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For private hire and sleeping twelve, head out cayman tracking by motorized canoe, swim with pink river dolphins - the boto rosa -- or try a spot of piranha fishing before taking to the skies in a Cessna Amphibian to experience the jungle like a toucan.

FORBES: First Class Amazon River Cruise

The main culprit in the wavelike series of amphibian crashes is a chytrid fungus, known as Bd.

NEWYORKER: The Sixth Extinction?

The Global Amphibian Assessment has warned that a third of the world's amphibian species are in danger of extinction, many because of the chytrid fungus.

BBC: NEWS | Science/Nature | Warming link to amphibian disease