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The behaviour of the hermit crab Clibanarius vittatus was studied as it investigated shells prior to and during shell exchange interactions. Crabs behaved in a manner predicted by the negotiations model of resource exchange, that is, shells were primarily exchanged between crabs when both crabs benefited in shell fit from the exchange. During initial investigation of shells, crabs in poorly fitting shells selected shells that (1) were similar to the preferred shell size of the investigatingdoi:10.1006/anbe.1996.0060 fatcat:qh73t7ykfbhcnfilrn3rirebz4