These are closely related species, but Asian small-clawed otters perform extractive foraging movements to exploit crabs and shellfish while smooth-coated otters forage on fish. We studied potential drivers and functions of the well-known object play behaviour of rock juggling in Asian small-clawed ( Aonyx cinereus) and smooth-coated ( Lutrogale perspicillata) otters. However, why adults show object play remains poorly understood. In juveniles, object play may help develop skills to aid survival. Object play refers to the seemingly non-functional manipulation of inanimate items when in a relaxed state.
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