The Arcona evolved claws to get at the water pods concealed beneath the rocky soil of Cona, and ammonia is employed in a supplementary circulatory system used to rid waste from their bodies.

• 阿科纳人进化出长爪，能挖开科纳的砾状土壤，获取深层的少量水源。而氨被摄入“辅助循环系统”以排除体内的代谢物。