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DEFINITIONS <br /> Active nest—Any nest that is frequented or occupied by a raptor during the breeding season, or which <br /> has been active in any of the five previous breeding seasons. Many raptors use alternate nests in <br /> various years. Thus, a nest may be active even if it is not occupied in a given year. <br /> Active winter night roost—Areas where Bald Eagles gather and perch overnight, and sometimes <br /> during the day in the event of inclement weather. Communal roost sites are usually in large trees (live <br /> or dead)that are relatively sheltered from wind and are generally in close proximity to foraging areas. <br /> These roosts may also serve a social purpose for pair bond formation and communication among <br /> eagles. Many roost sites are used year after year. <br /> Human encroachment—Any activity that brings humans in the area. Examples include driving, <br /> facilities maintenance, boating,trail access (e.g., hiking, biking), etc. <br /> Hunting perch—Any structure on which a raptor perches for the purpose of hunting for prey. Hunting <br /> perches provide a view of suitable foraging habitat. Trees are often used as hunting perches, but other <br /> structures may also be used(utility poles, buildings, etc.). <br /> Surface occupancy—Any physical object that is intended to remain on the landscape permanently or <br /> for a significant amount of time. Examples include houses, oil and gas wells, tanks, wind turbines, <br /> roads,tracks, etc. <br /> CONTACT <br /> For further information contact: <br /> David Klute <br /> Bird Conservation Coordinator <br /> Colorado Division of Wildlife <br /> 6060 Broadway <br /> Denver, CO 80216 <br /> Phone: 303-291-7320 <br /> Email: david.klutegstate.co.us <br /> REFERENCES <br /> Bechard, M.J., and J.K. Schmutz. 1995. Ferruginous Hawk(Buteo regalis), The Birds of <br /> North America Online (A. Poole,Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the <br /> Birds of North America Online: http://bna.birds.cornell.edu/bna/species/172 <br /> Buehler, D.A. 2000. Bald Eagle (Haliaeetus leucocephalus), The Birds of North America Online <br /> (A. Poole,Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America <br /> Online: http:Hbna.birds.comell.edu/bna/species/506 <br /> Call, M. 1979. Habitat management guides for birds of prey. Technical Note No.338, U.S. Bureau of <br /> Land Management, Denver Service Center, Denver, CO. 69pp. <br />