“A method of identifying and distinguishing between ducks, swans, and geese is argued for in Eykman’s European Anatidae by size, form or colour of bill and feathering near the tail. The sexes differ little in swans and geese but widely in ducks: in particular, males have more conspicuous plumage.”

“A method of identifying and distinguishing between ducks, swans, and geese is argued for in Eykman’s European Anatidae by size, form or colour of bill and feathering near the tail. The sexes differ little in swans and geese but widely in ducks: in particular, males have more conspicuous plumage.”

— Victoria de Rijke