Current Status of the Black-Footed Ferret in Wyoming

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Abstract
A publicity campaign in 1973-1975 yielded 145 reliable reports of black-footed ferrets (Mustela nigripes) from 1851-1975. Field searches failed to locate any live ferrets. Of the sightings, 3/4 were in June-Sept. About 75% were within the range of white-tailed prairie dogs (Cynomys leucurus) and 25% in the range of black-tailed prairie dogs (C. ludovicianus). Two sightings were in association with Richardson ground squirrels (Spermophilus richardsonii) and 1 with golden-mantled ground squirrels (S. lateralis). Reports [34 or 35] were of dead animals; remains of 23 ferrets were located in museum and private collections. Most ferrets were seen in sagebrush-grasslands. Ferret mortality was often attributed to poisoning and trapping for coyotes and prairie dogs. Behavioral and ecological comparisons were made between the black-footed ferret and its nearest relative, the Amur Siberian polecat (M. eversmanii amurensis). Extensive habitat loss from prairie dog eradication over 70+ yr was the likely cause for the ferret''s decline. New techniques for locating ferrets were suggested. Management recommendations include protection of key prairie dog colonies and more strict regulation of prairie dog control.

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