SUMMARYThomas, D. G., and A. J. Dartnall. 1971. Ecological aspects of the feeding behaviour of two calidritine sandpipers wintering in south-eastern Tasmania. Emu 71: 20–26.Calidris ferrugineaandC. ruficollisare congeneric species wintering in the same tidal habitat. They do not compete when most densely concentrated during the early stages of the ebb, because C.ferrugineaforages usually below the water's edge andC. ruficollisabove it. AlsoC. ferrugineagets most of its food at a greater depth below the substrate surface. That ecological separation does not necessarily give rise to dietary differences is shown by the broad overlap of the items found in the stomachs. This applies to size and species of food-item. BothC. ferrugineaandC. ruficollisare largely opportunistic feeders, eating all suitable items encountered within a narrow range of size.