On 15 October 2004, while mist-netting at the Seven Mile Guard Station (elevation 1285 m; 42° 42′ 18″ N, 122° 4′ 26″ W) in the Klamath Ranger District of Winema National Forest, Oregon, we caught an immature Gamel’s White-crowned Sparrow (Zonotrichia leucophrys gambelii) with three legs. On examination, we found that the third leg originated from the right side of the cloaca (Figure 1). The leg was divided into two sections, the upper part (tibia) being fleshy, thick, and pink, ending in yellow scar tissue (Figure 2). The lower section of the leg (tarsus) was much thinner with little tissue over the bone, brownish in color, and ending with two partially formed digits (without claws) representing the toes normally directed forward and one hallux (with a claw). The leg was nonfunctional, hanging below the bird when perched. The sparrow appeared healthy in all other respects and was released after examination.