Crayfish (Decapoda) |
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Crayfish dig burrows in the substrate using their claws and tail to remove mud and carry it up to the surface. Some use the mud to create a chimney (up to 12cm high) at the burrow entrance to protect it from terrestrial predators, such as snakes. Freshwater crayfish can be anywhere from 4 to 16 cm in length. Male juvenile crayfish shed their exoskeleton (called molting) and become their sexual form, which has larger claws, a longer body, sharper spines, and a tougher exoskeleton. Being larger and tougher helps them battle other males during mating season. Once mating season is over, however, they molt again, after which they resemble juvenile crayfish once more. For self-defense, when crayfish are agitated or their legs are grabbed, the legs may break at a certain point (called the breaking point). If this occurs, the leg can be regenerated later. |
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