The name, green crab, can be deceiving. The color of this crab depends on the molting cycle the crab is undergoing. These colors can range from green to orange and even red in some cases. Green crabs are also visibly identifiable by the yellowish spots on the abdomen, which are also accompanied by five small spines also located on the front edge of the shell. The adult green crab only grows to about three inches in width and two inches in length. (Washington Dept 1997, Jaquette 1998)
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