Lobsters have feathery appendages called swimmerets, or pleopods, underneath their tails. These swimmerets help a lobster swim and are also where a female lobster (sometimes called a hen) carries her eggs. Swimmerets also can clue you in to the sex of a lobster. The first pair of swimmerets (the pair closest to the head) just behind the walking legs point up toward the head. They are thin, feathery, and soft on a female but hard and bony on a male.
The swim find along the bottom side of the tail are hard on the male's and feather like on female
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