A male mallard duck, which has a distinctive bright green head.
Compound of 'green' and 'head,' referring to the striking coloration of male mallard ducks. This simple descriptive term has been used in hunting and bird-watching communities for centuries.
Male mallards have such impossibly bright, iridescent green heads that they look almost artificial—this coloring helps them attract females, making the greenhead one of nature's most obviously successful advertising strategies!
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