National Geographic : 1928 Jul
THE NATIONAL GEOGRAPHIC MAGAZINE ) National Geographic Society FIDDLER CRABS It is probable that the Fiddlers outnumber any other species of crabs. They are common to nearly all shores, where their burrows honeycomb the banks between tide levels. The yellow-clawed individuals in the upper part of the picture are mud-inhabiting species, Uca pugilator. The lower are the Uca minax, with ovenlike entrances to their burrows, surrounded by balls of excavated sand.