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Greenback cutthroat trout <br />The greenback cutthroat trout (Oncorhynchus clarki stomias) is a member of the Salmonidae <br />family, and is a subspecies of O. clarki. The subspecies feeds on aquatic insects as well as <br />terrestrial invertebrates. <br />Traditionally, greenback cutthroat trout typically weighed between 1 and 2 pounds, and did not <br />exceed 12in in length. Presently, size is dependant upon elevation and population size. <br />Spawning is initiated in the spring when water temperatures reach 5-8°C. Although greenbacks <br />are spring spawners, older greenback males in high elevation stream, were observed to be in <br />spawning colors and running milt by mid-September. <br />Greenback cutthroat trout require clear, swift-flowing mountain streams with cover such as <br />overhanging banks and vegetation. Riffle areas are used for spawning. Juveniles tend to shelter <br />in shallow backwaters until large enough to fend for themselves in the mainstream. <br />Historically, the greenback is the only trout endemic to the headwaters of the, South Platte and <br />Arkansas River drainages within Colorado and a small segment of the South Platte drainage <br />within Wyoming. The exact historical distribution of the species is not known. The greenback <br />and the Rio Grande cutthroat trout (Oncorhynchus clarki virginalis), represent the easternmost <br />limits of native trout distribution in the western United States. <br />Since drainage from the TR-120 area does not enter the South Platte and Arkansas River <br />drainages OSM has determined that the TR-120 revision will "not effect" the continued existence <br />of the greenback cutthroat trout. <br />Yellow-billed cuckoo <br />The Yellow-billed cuckoo, (coccyzus americanus), is a medium sized bird with a slender, long- <br />tailed profile, slightly down-curved bill, which is blue-black with yellow on the lower half of the <br />bill. Plumage is grayish-brown above and white below, with rufous primary flight feathers. This <br />species occupies tall riparian habitat consisting of cottonwood over story and an under story of <br />dense willow or tamarisk at elevations of less than 6,500 feet above mean sea level. Suitable <br />habitat does not occur on or adjacent to the TR-120 revision area. Due to a lack of suitable <br />habitat OSM has determined that the TR-120 revision will "not effect" the continued existence of <br />the Yellow-billed cuckoo. <br />Gunnison's Prairie Dog <br />The Gunnison's prairie dog (Cynomys gunnisoni) is yellowish buff mixed with black above, <br />slightly paler below with a short, white-tipped tail. The terminal half of the tail is grayish white <br />in center. Typically, 12-14" in height, weighing 23-42 ounces, living 3-5 years in the wild, <br />longer in captivity and producing 1 litter per year of 1-8 young, born in early May; gestation 27- <br />33 days, pups emerge mid June.