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An easy way to tell the difference between an adult male and female crab is look at a crab's underside and examine the shape of its abdomen. By looking at the abdomen you can see the difference between adult males, adult females, and juvenile females.
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| The male has an abdomen (or apron) shaped like the Washington Monument. | The female has a rounded abdomen, shaped like a honey comb, or like the Capitol dome in Washington, D.C. | Immature female crabs have an abdomen that's more shaped like a triangle |