The mallard is undoubtably the most recognized waterfowl in the world. The familiar duck morphology is complemented with a iridesent blue speculum on the wings in both sexes. On the male, the notable characteristics are the green iridesent plumage on the head and neck, and curled black feathers on the tail. The female's plumage is drab brown.
Average mass: 1082 g.
Average mass: 1048.1 g.
Average basal metabolic rate: 4.068 W.