How to differentiate male and female wigeon in the field?

Identifying Key Characteristics

When identifying wigeon sex in the field, pay close attention to the head and throat area. Males have a distinctive green sheen on the head, which can be seen at close range, especially in the morning and evening when the light is low. The green sheen is most pronounced on the crown, forehead, and nape of the neck. In contrast, females have a duller grayish-brown head with no green sheen.

Bill and Plumage Differences

Observe the bill shape and size to determine the sex of the wigeon. Males have a larger, more robust bill than females, which is also more brightly colored. The bill is also more curved in males, giving it a distinctive “hook” shape. Females have a smaller, more slender bill that is less curved. In addition to the bill, note the plumage differences. Males have a more vibrant greenish-gray plumage with a white throat patch, while females have a duller grayish-brown plumage with no white throat patch.

Behavior and Posture

While the head, bill, and throat patch are the most reliable indicators of sex, also observe the behavior and posture of the wigeon. Males are generally more aggressive and territorial, while females are more docile and tend to stay closer to the water. In flight, males tend to lead the way, with females following closely behind. By combining these observations, you can increase your chances of accurately identifying the sex of the wigeon in the field.