Yabby's a name given in Australia to two different kinds of crustacean. The Freshwater yabby's a crayfish of the genus Cherax (infraorder Astacidea, family Parastacidae). They're often caught for food. A widespread species's the common yabby, Cherax destructor. The Marine yabby's a ghost shrimp (infraorder Thalassinidea), which lives in deep burrows in the intertidal zone. They're used as bait for fishing, especially in Queensland and northern New South Wales. A common species in south-easte… (More on Yabby)