Wing span: 34"
Weight: 2-4.7 lbs.
Color: As is common in many bird species, male and female Common Mergansers exhibit different coloring. The male’s smooth, dark metallic green head, red bill, dark back, and white breast and belly are striking. By contrast, the smaller female has a chestnut-colored head with a small crest, an orange bill, and a grayish back and flanks. Juveniles resemble adult females.