From Hoosier Folklore, Vol. 5, p. 19, March, 1946:
Although it is difficult to determine just where a story of this sort has its beginning, this one seems to have originated in the Gum Creek bottom near Mt. Vernon. During the summer of 1941, a preacher was hunting squirrels in the woods along the creek when a large animal that looked something like a baboon jumped out of a tree near him. The preacher struck at the beast with his gun barrel when it walked toward him in an upright position. He finally frightened it away by firing a couple of shots into the air.
Later the beast began to alarm rural people by uttering terrorizing screams mostly at night in the wooded bottom lands along the creeks. School children in the rural districts sometimes heard it, too, and hunters saw its tracks.… By early spring of 1942, the animal had local people aroused to a fighting pitch. About that time, a farmer near Bonnie reported that the beast had killed his dog. A call went out for volunteers to join a mass hunt to round up the animal.
The beast must have got news of the big hunt, for reports started coming in of its appearance in other creek bottoms, some as much as 40 or 50 miles from the original site. A man driving near the Big Muddy River, in Jackson County, one night saw the beast bound across the road. Some hunters saw evidence of its presence away over in Okaw. Its rapid changing from place to place must have been aided considerably by its ability to jump, for, by this time, reports had it jumping along at from 20 to 40 feet per leap.
It is impossible to say how many hunters and parties of hunters, armed with everything from shotguns to ropes and nets, went out to look for the strange beast in the various creek bottoms where it had been seen, or its tracks had been seen, or its piercing screams had been heard. Those taking nets and ropes were intent on bringing the creature back alive.
Usually this strange beast can’t be found, and interest in it dies as mysteriously as it arose in the beginning.… About 25 years ago, a ‘coon hunter from Hecker one night heard a strange beast screaming up ahead on Prairie du Long Creek. Hunters chased this phantom from time to time all one winter. Their dogs would get the trail, then lose it, and they would hear it screaming down the creek in the opposite direction. It was that kind of creature: you’d hear it up creek, but when you set out in that direction you’d hear it a mile down creek.