California spiny lobster is known for its lack of large claws on its leg like most lobster species. Instead it has two large spiny antennas used for producing loud noise to scare off predators and sensory perception. To grow they will shed their exoskeleton by taking in seawater to have the old shell to crack along the sides to get out shelling. This process will leave the lobster soft and extremely vulnerable to predators until the new hard exoskeleton forms. This process happens annually for adults and multiples a year for juveniles to keep up with their growth.