Plumage is essentially identical to Lesser Yellowlegs. Greater is larger overall with longer, thicker, more upturned bill, longer neck, blockier head, and bigger chest. Forages actively on mudflats and in shallow pools and marshes, often in loose mixed flocks with Lesser Yellowlegs. Somewhat more likely to be found in larger, more open habitats than Lesser, but much overlap. Listen for strong, ringing “tew tew tew!” calls, louder than Lesser, and usually three or four notes instead of one or two (though Greater can also give single notes).