Northern Prairie Wildlife Research Center
GARY L. IVEY, DAVID G. PAULLIN, AND
CARROLL D. LITTLEFIELD
Malheur National Wildlife Refuge, HC- 72, P.O. Box 245, Princeton,
97721; U.S. Fish and Wildlife Service, 2800 Cottage Way, Room 1823,
Sacramento CA 95825; HCR-4, P.O. Box 212, Muleshoe, TX 79347
Raven control was achieved primarily by using egg bait injected with DRC-1339, a very selective corvicide. Some ravens were also shot. Aerial gunning was the primary tool used for coyote control, followed by trapping and snaring, shooting, and denning. Raccoons were primarily trapped, although, a few were taken using hunting dogs and shooting. A total of 315 ravens, 1,078 coyotes, and 67 raccoons were removed from the area over the past four years.
Before the control Program (1973-85) crane nest success averaged 47% while during the control program nest success averaged 69%. Crane chick survival averaged 12% before the program, compared with 23% during the program. Crane production averaged 10.9 chicks per 100 pairs before the program, compared with 20.6 chicks per 100 pairs during the program. Also, waterfowl production was enhanced by the control efforts.