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Microgeographic Variation In The Song Of The Sage Sparrow, Terrell Rich May 1981

Interspecific Allopreening Solicitation In Female Brewer's Blackbirds, Nicolaas A. Verbeek, Robert W. Butler, Howard Richardson May 1981

Estimation Of The Relative Protein Cost Of Reproduction In Birds, Charles T. Robbins May 1981

Time-Budgets, Energy Needs And Kleptoparasitism In Breeding Lesser Sheathbills (Chionis Minor), Alan E. Burger May 1981

Feeding Ecology Of Marine Cormorants In Southwestern North America, David G. Ainley, Daniel W. Anderson, Paul R. Kelly May 1981

Breeding Season Ecology And Behavior Of Ridgway's Hawk (Buteo Ridgwayi), James W. Wiley, Beth Nethery Wiley May 1981

Recent Publications, The Condor May 1981

News And Notes, The Condor May 1981

Observations At A Twenty-Egg Killdeer Nest, John T. Mundahl, Oscar L. Johnson, Mark L. Johnson May 1981

Inheritance Of Color Phases Of Ferruginous Hawks, Sheila M. Schmutz, Josef K. Schmutz May 1981

Front Matter (Pdf), The Condor Feb 1981

Observations Of Feeding At Sea By A Peregrine Falcon And An Osprey, William Rogers, Stephen Leatherwood Feb 1981

News And Notes, The Condor Feb 1981

Information For Contributors, The Condor Feb 1981

Recent Publications, The Condor Feb 1981

Plot Size As A Factor In Winter Bird-Population Studies, R. Todd Engstrom, Frances C. James Feb 1981

First Description Of The Nest, Eggs, And Young Of The Tumbes Sparrow (Aimophila [Rhynchospiza] Stolzmanni), Morris D. Williams Feb 1981

Nesting Of The Sage Thrasher, Sage Sparrow, And Brewer's Sparrow In Southeastern Idaho, Timothy D. Reynolds Feb 1981

Relationships Between Jackrabbit Abundance And Ferruginous Hawk Reproduction, Dwight G. Smith, Joseph R. Murphy, Neil D. Woffinden Feb 1981

Non-Random Orientation Of Gila Woodpecker Nest Entrances In Saguaro Cacti, Richard S. Inouye, Nancy J. Huntly, David W. Inouye Feb 1981

Flock Composition, Breeding Success, And Learning In The Brown Jay, Marcy F. Lawton, Carlos F. Guindon Feb 1981

Notes On Nesting Raptors In The Llanos Of Venezuela, William J. Madeh Feb 1981

Reproductive Performance Of Ring-Billed Gulls In Relation To Nest Location, Patricia Lynn Ryder, John P. Ryder Feb 1981

The Bulletin Board, The Condor Feb 1981

Age-Related Differences In Piracy Of Frigatebirds From Laughing Gulls, Michael Gochfeld, Joanna Burger Feb 1981

Jabiru Nest, Nest Building, And Quintuplets, Betsy Trent Thomas Feb 1981

Nest-Site Selection And The Radiative Environment Of The Warbling Vireo, Glenn K. Walsberg Feb 1981

Front Matter (Pdf), The Condor Nov 1980

Additional Puna Zone Bird Species On The Coast Of Peru, R. A. Hughes Nov 1980

Development Of Temperature Regulation In Nestling Tree Swallows, Richard L. Marsh Nov 1980