 A number of arthropod parasites have been recorded on this duck , including chewing mites of the families Philopteridae and Menoponidae , feather mites and skin mites . Internal helminth parasites include roundworms , tapeworms and flukes . In a survey in Florida , all 30 ducks tested carried at least two helminth species , although none had blood parasites . Only one duck had no mites or lice . 
