Relative abundance of woody plants and their utilization by beavers (Castor canadensis) were measured on watersheds in Ashtabula and Columbiana Counties, Ohio, in 1966-67. A food index showed aspen (Populus sp.), alder (Alnus sp.), hop-hornbeam (Ostrya virginiana), black cherry (Prunus serotina), willow (Salix sp.)> dogwood (Cornus sp.) and oak (Quercus sp.) to be major foods; 20 different wood...