Exactly why robber crabs have grown so big is a mystery, but with so few creatures making it to these remote islands, the giant crustaceans seem to have filled a niche normally taken by medium-sized mammals.

到底为什么盗蟹长得如此之大是个谜团，但是因为只有极少数的生物才能到达这些偏远的岛屿，所以这大甲壳纲动物似乎填补了通常由中型哺乳类动物占据的生态位。