patterns in the mud as a shelduck, tadorna tadorna, feeding at low tide in the river torridge estuary, appledore, devon

anatidae animal anseriformes appledore beach beak bideford bird birds birdwatching coast coastline common countryside devon duck ducks environment estuary feather feeding goose instow lake landscape low migration migratory mud native nature north ornithology outdoors patterns plumage pond redbilled river shelduck swamp tadorna tarka tide torridge waterbird waterfowl weir wetland wildlife wing