Duck Profile of the Week Uncategorized The mallard is 56–65 cm long, has a wingspan of 81–98 cm, and weighs 750–1,000 g. The breeding male is unmistakable, with a green head, black rear end and a yellow bill tipped with black (as opposed to the dark brown bill in females). Share this:Share Click to share on Facebook (Opens in new window) Facebook Like Loading... Related