Wood ducks can reach up to 21 ounces in weight and 21 inches in length, with a wingspan of 28 inches. The species is sexually dimorphic, meaning that males and females differ in appearance. Males have brightly colored heads, with iridescent green, blue and purple markings, red eyes and white lines running from the bill to the back of the head. Females have brownish-gray heads with white rings around the eyes.
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