two drake mallard ducks fighting on a winter lake

adversarial adversaries aggression anas animal battle behavior bird birds blue brown chasing combat compete competing competition dabblers dabbling day drake duck ducks feather feathers fighting flap flapping fowl freshwater game green head hostile hostility irridescent lake male mallard mallards marshes nature pecking platyrhynchos plumage pond splashing survival swimming water waterbird waterfowl wild wildfowl wildlife winter