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.

澳大利亞，小龍蝦

澳大利亞Claustral峽谷的小溪中，一只龍蝦正在躲避涉水而過的行者。這種小龍蝦（小形螫蝦的一種）很神奇，除了這種顏色，還有橘紅色和藍(lán)色的。這是由于水源的純度決定的，藍(lán)色表示，小龍蝦生活的水域很清潔。 

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