拥有坚硬的外骨骼与短足的甲壳类生物，常见于海岸或滩涂的岩缝与沙地间。遇到危险时会将身体蜷曲以抵御外力。主要以海藻与腐败的有机物为食。行动迅速，能躲避浪潮与阳光，是海边生态系统的清洁者。
A crustacean with a hard exoskeleton and short legs, it is discovered between rocks and sand on the beach or tidal flats. It can curl its body into a ball to avoid external shocks and mainly eats seaweed or decaying organic matter. It moves quickly to avoid waves and sunlight and serves as a cleaner in the beach ecosystem.