Food habits of 10 shorebird species [Tringa falvipes, Lobipes lobatus, Limnodromus griseus, Micropalama himantopus, Calidris minutilla, C. alpina, C. pusilla, Limosa haemastica, Pluvialis dominica, Charadrius semipalmatus] breeding at Churchill, Manitoba [Canada], were studied by stomach analysis. Samples of food [Diptera, coleoptera, plant seeds, spiders] available to foraging shorebirds were collected. The results of stomach analysis indicated that predator body size is positively correlated with average food size. Comparison of the food eaten and the food available indicated that large shorebirds tend to be more selective foragers, on the basis of food size, than small shorebirds. In general, the 10 shorebirds are exceptionally tightly packed along the food size spectrum, more than is expected theoretically. Other niche dimensions may be important in segregating the species. Relaxed competition in an environment of abundant resources may also explain high overlap among the shorebird community.