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common raven (Corvus corax). A mourning dove (Zenaida macroura) with nest was present. <br /> The large raptor nest on a rock face in the western portion of the site was occupied by a great <br /> horned owl (Bubo virginianus) with two owlets (observed through binoculars) during the June <br /> 2015 site survey. Direct observation included pronghorn antelope (Antilocapra americana), <br /> numerous eastern cottontail rabbit (Sylvilagus floridanus), short horned lizard (Phrynosoma <br /> hernandesi ), other lizards, and insects (including spider and butterfly). Animal sign included <br /> rodent (burrows) and domestic cow(dung and tracks). <br /> 5.0 NOXIOUS WEEDS <br /> No Colorado state-listed noxious weeds were observed during the 2015 site monitoring. <br /> Colorado Noxious Weed List is divided into a List A, B, C and Watch List based on control <br /> requirements as designated by the Commissioner and other entities (http://Uw,w.colorado.gov/cs <br /> /Satellite/a• Conservation/CBON/1251618874438). List A species are designated for eradica- <br /> tion (22 species statewide). List B weed species have state noxious weed management plans <br /> designed to stop the continued spread of these species (37 species statewide). For List C weed <br /> species, local governing bodies facilitate more effective integrated weed management on <br /> private and public lands with management plans designed to provide additional education, <br /> research, and biological control resources to jurisdictions that choose to require management of <br /> List C species (15 species statewide). Watch List weed species pose a potential threat to the <br /> agricultural productivity and environmental values of the lands of the state. The Watch List is <br /> intended to serve advisory and educational purposes only (22 species statewide). <br /> Table 3. Costilla County Noxious Weed List <br /> Common Name Scientific Name Colorado State List <br /> Bull thistle Cirsium vulgare B <br /> Canada thistle Cirsium arvense B <br /> Hoary cress Cardaria draba B <br /> Houndstongue Cynoglossum officinale B <br /> Leafy spurge Euphorbia esula B <br /> Musk thistle Carduus nutans B <br /> Russian knapweed Acroptilon repens B <br /> Yellow toadflax Linaria vulgaris B <br /> Field bindweed Convolvulus arvensis C <br /> Costilla County lists nine noxious weed species (eight from the List B and one from List C) as <br /> presented in Table 3. Previously two patches of noxious weeds near the mine entrance were <br /> present during 2005 to 2011. These noxious weed patches were comprised of Canada thistle <br /> 7 <br />