Mallard flock of hens (Anas platyrhynchos) {!--청둥오리--> From the U.S. Fish and Wildlife Service's online digital media library.  Check http://images.fws.gov/ for higher quality version.   Metadata  Title: Mallards   Alternative Title: Anas platyrhynchos   Creator: Karney, Lee   Source: WO-Lee Karney-1310  Publisher: U.S. Fish and Wildlife Service  Contributor: DIVISION OF PUBLIC AFFAIRS  Language: EN - ENGLISH  Rights: (public domain)  Audience: (general)  Subject: Karney, Waterfowl, Duck, Ducks, Hen, Brood    Description  Table Of Contents: The world's best known duck, the mallard breeds across the Northern Hemisphere and has been introduced to Australia and New Zealand. When startled, mallards launch into flight with an almost vetical leap from the surface. The mallard nest is usually built in grass or reeds within a hundred yards of water.      Date  Available: April 07 2004  Issued: April 06 2004  Modified: April 08 2004