Brown pereiopods and pleopods are present with fringing setae in red. The post-larva is characterised by the use of abdominal appendages (pleopods) for propulsion. The pleopods are often redder, and the uropods and telson are green. This is because female crabs brood fertilised eggs on their pleopods. Fertilised eggs are affixed to the female's pleopods, situated on the underside of the tail. Most crustaceans, such as shrimp, will usually swim by paddling with special swimming legs (pleopods). Between July and August, females carry around 100,000 eggs on their enlarged, feathery pleopods. The first pleopods of males are unusually twisted, and its larvae appear primitive. The post-larva swims using its pleopods. To incubate the eggs after spawning, females attach them to their pleopods. The post-larva or juvenile stage is characterised by the use of the pleopods for locomotion. They eat detritus which they bring into their burrow using their pleopods. Locomotion is mostly by swimming, the pleopods being used for this purpose. These are the sites of attachment of the pleopods (swimming legs). They are distinguished by the absence of the first pair of pleopods.