Bright bills in mallards helps duck semen fight bacteria

(PhysOrg.com) -- The male Mallard duck (Anas platyrhynchos) is known for its colorful neck and a bill that ranges in color from dull green to bright yellow, depending on the amount of carotenoid pigment it contains. Females favor the males with the most colorful bills, and now new research in Norway has shown that these males produce semen with better antibacterial properties.

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