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The Rusty crayfish can be identified by the dark brown spot on its side, orange and black pinchers and narrow thorax plate.

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Hood River native Rachel Mallon, left, prepares to leave Hood River marina Monday with Leah Shamlian, as part of an adventure sponsored by OAR Northwest, a non-profit outdoor education program based in Washington state. Mallon and Shamlian are on a 45-day row from the Columbia River headwaters in British Columbia to the mouth of the river.