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Crayfish, Australia
A foot-long crayfish dodges a hiker fording a stream in Australia's Claustral Canyon. The color of these crayfish, called yabbies by canyoneers, remains a puzzle. In some streams they're orange. In others they're blue. The difference is due partly to water purity—the blue ones are found in the clearest water.
澳大利亚，小龙虾
澳大利亚Claustral峡谷的小溪中，一只龙虾正在躲避涉水而过的行者。这种小龙虾（小形螫虾的一种）很神奇，除了这种颜色，还有橘红色和蓝色的。这是由于水源的纯度决定的，蓝色表示，小龙虾生活的水域很清洁。
