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Zammuto, R. M., E. C. Franks, and C. R. Preston. 1981. Factors associated with the interval between feeding visits in brood-rearing Chimney Swifts. Journal of Field Ornithology 52:134-139.

Merritt, J.F. 1981. Clethrionomys gapperi. Am. Soc. Mamm.,Mammalian Species No. 146. 9 pp.

Wentworth, T.R. 1981. Vegetation on limestone and granite in the Mule Mtn, Arizona. Ecology. 62(2):469-482.

Vogt, R. C. 1981c. Natural history of amphibians and reptiles of Wisconsin. Milwaukee Public Museum. 205 pp.

Crum, H.A., and L.E. Anderson. 1981. Mosses of eastern North America. 2 Volumes. Columbia Univ. Press, New York. 1328 pp.

U.S. Fish and Wildlife Service (USFWS). 1981. Plymouth red-bellied turtle recovery plan. U.S. Fish and Wildlife Service, Region 5. 13 pp.

Carlton, K. 1981. Jornada del Muerto Lava Cave System, a report. BLM, Socorro District. 25 September 1981. 24 pp.

Spellenberg, R. Ward, D. 1981. Status Report on Silene Wrightii. Department of Biology, New Mexico State University, Las Cruces, New Mexico. USFS

Cannon, R. W., and F. L. Knopf. 1981. Lek numbers as a trend index to prairie grouse populations. Journal of Wildlife Management 45:776-778.

Marshall, J. T., and R. D. Sage. 1981. Taxonomy of the house mouse. Symp. Zool. Soc. London 47:15-25.

Wiens, J.A., and J.T. Rotenberry. 1981. Habitat associations and community structure of birds in shrubsteppe environments. Ecological Monographs 51:21-41.

Hammerquist-Wilson, M. N. and J. A. Crawford. 1981. Response of bobwhite to cover changes within three grazing systems. Jounal of Range Management 34:213-215.

Phillips, D. P., W. E. Childers, and G. S. Whitt. 1981. Management implications for different genetic stocks of largemouth bass (Micropterus salmoides) in the United States. Canadian Journal of Fisheries and Aquatic Sciences 38:1715-1723.

Freedman, B., C. Beauchamp, I. A. McLaren, and S. I. Tingley. 1981. Forestry management practices and populations of breeding birds in a hardwood forest in Nova Scotia. Canadian Field-Naturalist 95:307-311.

Matteson, S. W., and J. O. Riley. 1981. Distribution and nesting success of Zone-tailed Hawks in west Texas. Wilson Bulletin 107:719-723.

Day, J. C. U. 1981. Status of bitterns in Europe since 1976. British Birds. 74:10-6.

Morrison, M.L. 1981b. The structure of western warbler assemblages: analysis of foraging behavior and habitat selection in Oregon. Auk 98:578-588.

Dressler, R. 1981. The Orchids: Natural History and Classification. Harvard Univ. Press, Cambridge, MA. 332 pp.

Ashton, R. E., Jr., and P. S. Ashton. 1981. Handbook of reptiles and amphibians of Florida. Part One: The Snakes. Windward Publishing Company, Miami, Florida. 176 pp.

Christenson, B. L.. 1981. Reproductive ecology of and response to disturbance by common loons in Maine. University of Maine, Orono, Maine. M.S. thesis.

WESTEC Service, Inc. 1981. 810400. Status Report submitted to the Office of Endangered Species.

Confer, J. L., and K. Knapp. 1981. Golden-winged warblers and blue-winged warblers: the relative success of a habitat specialist and a habitat generalist. Auk 98:108-114.

Marking, L. L. and T. D. Bills. 1981. Sensitivity of four species of carp to selected fish toxicants. North American Journal of Fisheries Management. 1:51-4.

Zammuto, R. M. and E. C. Franks. 1981. Environmental effects on roosting behavior of Chimney Swifts. Wilson Bulletin 93:77-84.

Hamman, R. L. 1981. Hybridization of three species of chub in a hatchery. Progressive Fish-Culturist 43:140-141.

Procter-Gray, E., and R. T. Holmes. 1981. Adaptive significance of delayed attainment of plumage in male American redstarts: tests of two hypotheses. Evolution 35:742-51.

Hall, G.A. 1981b. Fall migration patterns of wood warblers in the southern Appalachians, USA. Journal of Field Ornithology 52:43-49.

Maurer, B. A., L. B. McArthur, and R. C. Whitmore. 1981. Effects of logging on guild structure of a forest bird community in West Virginia. American Birds 35:11-13.

Dexter, R. W. 1981b. Chimney Swifts reuse ten-year-old nest. North American Bird Bander 6:136-137.

Moulton, M. P., J. R. Choate, S. J. Bissell, and R. A. Nicholson. 1981. Associations of small mammals on the central high plains of eastern Colorado. Southwestern Naturalist 26(1):53-57.

Hall, E. R. 1981a. The Mammals of North America, second edition. Vols. I & II. John Wiley & Sons, New York, New York. 1181 pp.

Dunham, A. E. 1981. Populations in a fluctuating environment: the comparative population ecology of the iguanid lizards Sceloporus merriami and Urosaurus ornatus. University of Michigan Museum of Zoology Miscellaneous Publications (158): 1-62.

Escherich, P. C. 1981. Social biology of the bushy-tailed woodrat, Neotoma cinerea. Univ. California Pub. Zool. 110: xiv + 132 pp.

Becker, D. M. and I. J. Ball. 1981. Impacts of surface mining on Prairie Falcons: Recommendations for monitoring and mitigation. Unpubl. Rep. Montana Coop. Wildl. Res. Unit, Univ. Montana, Missoula.

Dinsmore, J. J. 1981. Piping plovers - a synthesis of the literature and an annotated bibliography. Unpublished report. 28 pp.

Worthington, R.D. 1981. Status report, Oenothera organensis, Organ Mountains Primrose, Fish and Wildlife Service, Albuquerque, NM. 9 p.

Koppinger, D.G. 1981. U.S. Geological Survey topographic map containing generalized locations of Rumex orthoneurus throughout the Coronado National Forest. Arizona Natural Heritage Program. 8 p.

Crawford, H. S., R. G. Hooper, and R. W. Titterington. 1981. Songbird population response to silvicultural practices in central Appalachian hardwoods. Journal of Wildlife Management 45:680-92.

Massey, B. W. 1981. A least tern makes a right turn. Nat. Hist. 90:61-72.

Havlik, M.E. 1981. The historic and present distribution of the endangered mollusk Lampsilis higginsi (Lea 1857). Bulletin of the American Malacological Union for 1980: 19-22.

Rickard, W. H., R. E. Fitzner, and C. E. Cushing. 1981. Biological colonization of an industrial pond, status after two decades. Environmental Conservation 8:241-7.

Morrison, M. L. 1981a. Population trends of the Loggerhead Shrike in the United States. Am. Birds 35(4): 754-757.

Ferguson, H.L., and P.D. Jorgensen. 1981. An efficient trapping technique for burrowing owls. North American Bird Bander Oct.-Dec.:149.

Munther, G. L. 1981. Beaver management in grazed riparian ecosystems. Proceedings of the Wildlife-Livestock Relationships Symposium, Coeur d'Alene, Idaho, pages 234-241.

Hall, E. R. 1981a. The Mammals of North America, second edition. Vols. I & II. John Wiley & Sons, New York, New York. 1181 pp.

Freeman, P. W. 1981. A multivariate study of the family Molossidae (Mammalia, Chiroptera): morphology, ecology, evolution. Fieldiana Zool. 7:1-173.

Broschart, M.R. (1981) Nesting Study of a Peregrine Falcon Pair in the Carson National Forest, New Mexico.

Fritts, S. H., and L. D. Mech. 1981. Dynamics, movements, and feeding ecology of a newly protected wolf population in northwestern Minnesota. Wildlife Monographs No. 80:1-79.

Jacobs, R.W. (1981) Environmental Assessment on Rio Grande Cutthroat Trout Restoration. Retrieved from Regional Office, USFS. 17 p.

Fletcher, R.1981. Anticipated Effects of Timber sale on Allium gooddingii. United States Forest Service (USFS) Regional Office, Albuqueruqe, NM. p.9.

Worthington, R. 1981. Status Report for Potentilla sierrae-blancae. Endangered Species Office, Fish and Wildlife Service, Albuquerque, New Mexico. USDS

Dalsted, K. J., et al. 1981. Application of remote sensing to prairie dog management. Journal of Range Management 34:218-23.

Morrison, M. L. 1981a. Population trends of the Loggerhead Shrike in the United States. American Birds 35(4):754-7.

Inouye, R. S., N. J. Huntly and D. W. Inouye. 1981. Non-random orientation of Gila Woodpecker nest entrances in saguaro cacti. Condor 83:88-89.

Rollins, D. 1981. Diets of sympatric bobwhite and scaled quail in Oklahoma. Proceedings of the Annual Conference of the Southeastern Association of Fish and Wildlife Agencies 35:239-248.

Opler, P. A. 1981. Management of prairie habitats for insect conservation. Natural Areas J. 1(4): 3-6.

Fitch, H.S., W.S. Brown, and W.S. Parker. 1981. Coluber mormon, a species distinct from C. constrictor. Trans. Kansas Acad. Sci. 84:196-203.

Potter, E. F. 1981. Effects of cool weather on nesting behavior and development in the Yellow-billed Cuckoo. Chat 45:15-16.

Hayes, B. 1981. The grizzly bear: portraits from life. 370 pp.