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Eco Field Guide: Atlantic Rock Crab
http://www.ecokids.ca/pub/eco_info/topics/field_guide/underwater/crab.cfm
Unique information, scientific name, and picture provided.
eNature: Atlantic Rock Crab
http://www.enature.com/fieldguide/showSpeciesSH.asp?curGroupID=8&shapeID=1063&curPageNum=2&a
Picture and brief description of the rock crab.