Male blue swimmer crabs bigger and more colourful than the females, with a dark-blue carapace, pale belly and rich blue on their legs and claws.<br>Females crabs are a mottled brown. Males also have longer claws in proportion to their carapace than females. However the easiest way to check if a blue swimmer crab is male or female is to turn it upside down and look at the V-shaped abdominal flap on its underside. A male's<br>flap is narrow and angular, while a female's flap is broad and rounded
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