background: protozoa are common in poultry and otherbirds and can cause mild to severe disease. objectives: thisstudy was concerned with the prevalence of parasitic protozoa inwild waterfowl in caspian sea lagoons in the north of iran.methods:atotal of 293 waterfowl belonging to various generaincluding tadorna tadorna (common shelduck),aythya fuligula(tufted duck), aythya ferina (common puchard...