Contents
Population Size and Factors Affecting At-sea Distributions of Four Endangered Procellariids in the Tropical Pacific
Larry B. Spear, David G. Ainley, Nady Nur, and Steve N. Howell
Trans-beringia Comparisons of Mitochondrial Dna Differentiation in Birds
Robert M. Zink, Sievert Rohwer, Alexander V. Andreev, and Donna L. Dittmann
Phylogenetic Relationships of the Cinnamon Tyrant, Neopipo Cinnamomea, to the Tyrant Flycatchers (tyrannidae)
Jason A. Mobley and Richard O. Prum
Correcting Biased Estimates of Dispersal and Survival Due to Limited Study Area: Theory and an Application Using Wrentits
Mitchell Baker, Nadav Nur, and Geoffrey R. Geupel
Passage Rates of Digesta Markers in the Gut of the Hoatzin, a Folivorous Bird with Foregut Fermentation
Alejandro Grajal and Ornella Parra
Habitat Configuration around Spotted Owl Sites in Northwestern California
John E. Hunter, R. J. Gutierrez, and Alan B. Franklin
Nest-site Relationships among Cavity-nesting Birds of Riparian and Snowpocket Aspen Woodlands in the Northwestern Great Basin
David S. Dobkin, Adam C. Rich, Jennifer A. Pretare, and William H. Pyle
Ecological and Physiological Effects on Egg Laying Intervals in Ptarmigan
Karen L. Wiebe and Kathy Martin
Food Availability and Egg-laying of Captive European Starlings
T. Meijer and U. Langer
Demography and Movements of Apapane and Iiwi in Hawaii
C. John Ralph and Steven G. Fancy
Habits and Habitats of Mountain Plovers in California
Fritz L. Knopf and Jeffery R. Rupert
Prey of Peregrine Falcons Breeding in West Greenland
Robert N. Rosenfield, James W. Schneider, Joseph M. Papp, and William S. Seegar
Predation and Kleptoparasitism by Migrating Parasitic Jaegers
Marc Belisle and Jean-Francois Giroux
Foraging Behavior of American Redstarts in Breeding and Wintering Habitats: Implications for Relative Food Availability
Irby J. Lovette and Richard T. Holmes
Geographic, Ecological and Subspecific Variation in the Song of the Rufous-browed Peppershrike (cyclarhis Gujanensis)
Pablo L. Tubaro and Enrique T. Segura
Communal Parental Care by Monogamous Magpie Hosts of Fledgling Great Spotted Cuckoos
Manuel Soler, Jose Javier Palomino, Juan Gabriel Martinez, and Juan Jose Soler
Book Reviews
Christopher W. Thompson
New Books in Ornithology
Christopher W. Thompson
Covers
Back Matter (PDF)
The Condor
Front Matter (PDF)
The Condor
Commentary
Low Power and Implications for Female Mate Choice Theory
Kathleen G. Beal
Parental Care Not Likely to Explain Poor Mating Success in Yearling Male American Redstarts
Kevin E. Omland and Thomas W. Sherry
Short Communications
Sex-biased Host Selection and Success of Kleptoparasitic Behavior of the Great Frigatebird in the Northwestern Hawaiian Islands
Robert E. Cummins
Unusual Parasitism by the Bronzed Cowbird
Ethan D. Clotfelter and Timothy Brush
Courtship Displaying and Intrasexual Competition in the Bronzed Cowbird
Ethan D. Clotfelter
Evidence of Conspecific Nest Parasitism and Egg Discrimination in the Sora
Michael D. Sorenson
Differences in Singing Behavior Between Rufous-collared Sparrows in Costa Rica and Northwestern Argentina
James R. Fotheringham
Pied Flycatchers Prefer to Nest in Clean Nest Boxes in an Area with Detrimental Nest Ectoparasites
Santiago Merino and Jaime Potti
Mobbing of Eastern Screech-owls: Predatory Cues, Risk to Mobbers and Degree of Threat
Frederick R. Gehlbach and Jill S. Leverett
Historical Perspectives
Condor Physiology
William R. Dawson