fiddler crab
['snail', 'horned viper, cerastes, sand viper, horned asp, Cerastes cornutus', 'crane', 'ear, spike, capitulum', 'nematode, nematode worm, roundworm', 'great white shark, white shark, man-eater, man-eating shark, Carcharodon carcharias', 'screwdriver']