| helminths in ruffed grouse at the host's southeastern range boundary. | carcasses of 268 ruffed grouse (bonasa umbellus) collected in eastern tennessee (usa) from october 1983 through february 1988 were examined between 16 january 1985 and 25 april 1988 for non-filarioid helminths. three nematode species and one cestode species were found. the two most common parasites were the cecal worm heterakis bonasae (81% prevalence, mean intensity +/- sd of 62 +/- 114) and the tapeworm echinolepis carioca (27% prevalence, 30 +/- 73 mean intensity). age and sex of host were su ... | 1997 | 9249696 |