Great Basin Naturalist


A population decline of about 50% from 1974 to 1981 for Turkey Vultures (Cathartes aura) was found at a traditional roosting site at Malheur National Wildlife Refuge in Oregon. This decline may have been due to a region-wide reduction in this species, to the possible but improbable formation of a new but undiscovered roost, or to a reduction in feeding opportunities caused by the decreased use of the refuge by cattle.