In the mountains of Colorado, where in summer the woods are becoming infested with tourists, much uneasiness has been caused by the presence of the slide-rock bolter. This frightful animal lives only in the steepest mountain country where the slopes are greater than 45 degrees. It has an immense head, with small eyes, and a mouth somewhat on the order of a sculpin, running back beyond its ears. The tail consist of a divided flipper, with enormous grab-hooks, which it fastens over the crest of the mountain or ridge, often remaining there motionless for days at a time, watching the gulch for tourists or any other hapless creature that may enter it. At the right moment, after sighting a tourist, it will lift its tail, thus loosening its hold on the mountain, and with its small eyes riveted on the poor unfortunate, and drooling thin skid grease from the corners of its mouth, which greatly accelerates its speed, the bolter comes down like a toboggan, scooping in its victim as it goes, its own impetus carrying it up the next slope, where it again slaps its tail over the ridge and waits. Whole parties of tourists are reported to have been gulped at one scoop by taking parties far back into the hills. The animals is a menace not only to tourist but to the woods as well. Many a draw through spruce-covered slopes has been laid low, the trees being knocked out by the roots or mowed off as by a scythe where the bolter has crashed down through from the peaks above.