Identification: A medium-sized wader with yellowish green legs. From the similar looking Common Sandpiper by its taller looking, more upright posture and more spotted upperparts. The similar but rare Green Sandpiper also has spotted upperparts, but typically has a more horizontal posture like the Common Sandpiper, and with supercilium that does not extend past the eye. The Grey-tailed Tattler, that is typically not found in the same habitat, has much cleaner upperparts, brighter green legs and thicker looking bill.