The Common Teal is the smallest dabbling duck at 34-38 cm length with a 53-59 cm wingspan. The breeding male has grey flanks and back, with a yellow rear end and a white-edged green speculum, obvious in flight or at rest. It has a chestnut head with a green eye patch. It is distinguished from drake Green-winged Teal by a horizontal white scapular stripe, no vertical white bar on side of breast, and thin buff lines on its head.The females are light brown, with plumage much like a female Mallard. They can be distinguished from most ducks on size and shape, and the speculum, although distinguishing them from female Green-winged Teal is difficult.In non-breeding (eclipse) plumage, the drake looks more like the female.