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Front Matter (Pdf), The Condor Feb 1989

Heritability Of Wing Length And Weight In European Bee-Eaters(Merops Apiaster), C. M. Lessells, G. N. Ovenden Feb 1989

Similarity In The Development Of Foraging Mechanics Among Sibling Ospreys, Thomas C. Edwards Jr. Feb 1989

Book Reviews, March F. Lawton Feb 1989

Environmental Factors Influencing Nest-Site Preference In White-Browed Sparrow-Weavers (Plocepasser Mahali), J. W. Ferguson, W. R. Siegfried Feb 1989

Parental Attendance And Brood Care In Four Argentine Dabbling Ducks, Frank Mckinney, Gwen Brewer Feb 1989

Reproductive Biology Of Shrubsteppe Passerine Birds: Geographical And Temporal Variation In Clutch Size, Brood Size, And Fledging Success, John T. Rotenberry, John A. Wiens Feb 1989

Observations On The Foraging Ecology And Social Behavior Of The Bridled White-Eye, Robert J. Craig Feb 1989

The Importance Of Invariant And Distinctive Features In Species Recognition Of Bird Song, Douglas A. Nelson Feb 1989

Mate Fidelity And Breeding-Site Specificity Of The Turquoise-Browed Motmot, Robert F. Martin, Peter E. Scott, Mark W. Martin Feb 1989

Nestling And Egg Destruction By House Wrens, Michael S. Quinn, Geoffrey L. Holroyd Feb 1989

Effects Of Helpers On Nestling Care And Breeder Survival In Pygmy Nuthatches, William J. Sydeman Feb 1989

Fall Colony Attendance And Breeding Success In The Common Murre, M. P. Harris, S. Wanless Feb 1989

Contact Zones Of Avian Congeners On The Southern Great Plains, Keith L. Dixon Feb 1989

Body-Mass Variation In Breeding Northern Wheatears: A Field Experiment With Supplementary Food, Juan Moreno Feb 1989

Two New Records Of Birds For Southern Mexico, J. Luis Rangel-Salazar, J. Humberto Vega-Rivera Feb 1989

Notes On The Breeding Of Chestnut-Bellied Herons (Agamia Agami) In Costa Rica, Manuel Marin A. Feb 1989

Nonrandom Mating In Feral Pigeons, Richard F. Johnston, Steven G. Johnson Feb 1989

Mate Feeding By Western And Clark's Grebes, Gary L. Nuechterlein, Robert W. Storer Feb 1989

Intrasexual Aggression And The Mating Behavior Of Brown-Headed Cowbirds: Their Relation To Population Densities And Sex Ratios, David A. Yokel Feb 1989

Dispersal In The Communally Breeding Groove-Billed Ani (Crotophaga Sulcirostris), Bonnie S. Bowen, Rolf R. Koford, Sandra L. Vehrencamp Feb 1989

Food Habits Of The Whiskered Auklet At Buldir Island, Alaska, Robert H. Day, G. Vernon Byrd Feb 1989

Effects Of Varied Electrophoretic Conditions On Detection Of Evolutionary Patterns In The Laridae, Shannon J. Hackett Feb 1989

Nest-Site Selection By Yellow-Footed Gulls, Larry B. Spear, Daniel W. Anderson Feb 1989

Dependency On Testosterone Of Photoperiodically-Induced Vernal Fat Deposition In Female White-Crowned Sparrows, Hubert Schwabl, Donald S. Farner Feb 1989

An Experimental Test Of Prey Distribution Learning In Two Paruline Warblers, Christopher J. Whelan Feb 1989

Fat Cyclicity, Predicted Migratory Flight Ranges, And Features Of Wintering Behavior In Pacific Golden-Plovers, Oscar W. Johnson, Martin L. Morton, Phillip L. Bruner, Patricia M. Johnson Feb 1989

The Silky-Tailed Nightjar And Other Neotropical Caprimulgids; Unraveling Some Mysteries, John William Hardy, Roberto Straneck Feb 1989

In Memoriam, Emily Dinnin Smith Feb 1989

News And Notes, The Condor Feb 1989