"Reports show that both species [cougar and wolverine] were present historically... Periodic sightings of both species since this era [1904-1925] occur in park records, suggesting that remnant populations persisted in the Yellowstone area." (1)

"From 1960 through August, 1973, 32 reliable reports of woverine (25 sightings, 7 tracks) were made within or adjacent to the park. From 1974 through 1985, 31 comparable reports (28 sightings of 29 animals, 3 tracks) were made (Table 2). Annually, occurrences varied from 0 to 7. Reports were not adequate to allow speculation about population status, but the pair of adults seen in the vicinity of Canyon in 1982 suggested the presence of breeding animals. Observations were made parkwide, usually in summer; rare winter observations usually were associated with ungulate winter ranges." (2)

"Termination of the use of of poisons for predator control on federal lands surrounding Yellowstone in the early 1970's also may have benefited both species, particularly a carrion feeder such as the wolverine." (2)

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