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Crayfish

Crayfish, sometimes called crawfish, are freshwater crustaceans resembling small lobsters, to which they are closely related.

They are found in bodies of fresh water that do not freeze to the bottom, and which have shelter against predators.

Most crayfish cannot tolerate polluted water.

Note: This article excerpts material from the Wikipedia article "Crayfish", which is released under the GNU Free Documentation License.

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