Shell use by juvenile fiddler crabs Uca pugnax and U. pugilator

►Study highlights up to 79% shell use by juvenile fiddler crabs in a salt marsh. ►Uca pugnax juveniles were the dominant species found in shells. ►Shell use varied with the size and sex of juvenile fiddler crabs. ►Significantly more juveniles were found in empty shells during flood than ebb tide. ►Shell occupancy varied with site and was highest during the summer months.