Two Mallards (Anas platyrhynchos) swim upstream in the Peak District National Park, UK.

anas platyrhynchos autumn adult male posing swim profile shot overview reflection mallard duck anas platyrhynchos sexual dimorphism anas national park female duck least concern december water surface peak district national park copy space nobody fall season adults males posed pose settlings settling swimming action swimming profile sights profile sight profile shots profile view profile views side view overviews global sight global sights full length reflections mirror image reflected reflecting mallard ducks anas platyrhynchos sexual dimorphisms sexual distinguishability sexual distinguishabilities national parks sensitive natural areas female ducks least concern species water surfaces watersurface watersurfaces with nobody temperate season seasons atmosphere stage of development individual locomotion motion shot light effect duck anas sp dabbling duck wild duck palmiped bird wild animal general morphology morphology organism anatinae anatidae anseriformes aves tetrapoda vertebrata chordata deuterostomia coelomata bilateria metazoa opisthokonta eukaryota environment protection environment management biodiversity management environment female low risk iucn) lr iucn red list of threatened species species water matter matter substance east midlands region of england great britain united kingdom european union europe