Contents
Effects of Microhabitat, Flocking, Climate and Migratory Goal on Energy Expenditure in the Annual Cycle of Red Knots
Popko Wiersma and Theunis Piersma
Thermal Responses of Late Embryos and Hatchlings of the Sooty Tern
P. Mbaabu Mathiu, William R. Dawson, and G. Causey Whittow
Ion and Luminal Marker Concentrations in the Gut of Saline-acclimated Ducks
Maryanne R. Hughes and Lethika Raveendran
Spring Migration of Pacific Loons through the Southern California Bight: Nearshore Flights, Seasonal Timing and Distribution at Sea
Robert W. Russell and Paul E. Lehman
Migration of Bristle-thighed Curlews on Laysan Island: Timing, Behavior and Estimated Flight Range
Jeffrey S. Marks and Roland L. Redmond
The Kleptoparasitic Interactions Between Great Frigatebirds and Masked Boobies on Henderson Island, South Pacific
J. A. Vickery and M. De L. Brooke
The Effects of Food, Nest Predation and Weather on the Timing of Breeding in Tropical House Wrens
Bruce E. Young
Annual Variation in Birds and Plants of a Tropical Second-growth Woodland
Bette A. Loiselle and John G. Blake
Annual Variation in Bird Populations of Mixed Conifer-northern Hardwood Forests
John G. Blake, Joann M. Hanowski, Gerald J. Niemi, and Patrick T. Collins
Forced Extra-pair Copulation in the White-cheeked Pintail: Male Tactics and Female Responses
Lisa Guminski Sorenson
The Role of Nutrient Reserves for Clutch Formation by Northern Pintails in Alaska
Daniel Esler and James B. Grand
Behavioral and Morphological Correlates of Heterochrony in Hispaniolan Palm-tanagers
Mara A. Mcdonald and Michael H. Smith
Comparative Accuracy of Aerial and Ground Telemetry Locations of Foraging Raptors
John M. Marzluff, Mark S. Vekasy, and Chris Coody
Feeding Ecology of Sharp-shinned Hawks Nesting in Deciduous and Coniferous Forests in Colorado
Suzanne M. Joy, Richard T. Reynolds, Richard L. Knight, and Richard W. Hoffman
Barn Owl Reproduction: Patterns and Variation near the Limit of the Species Distribution
Carl D. Marti
The Effect of Mate Removal on the Vocal Behavior and Movement Patterns of Male and Female Eastern Screech-owls
Paul H. Klatt and Gary Ritchison
Fruit Choices by Captive American Robins
Mary F. Willson
Demography and Movements of the Omao (myadestes Obscurus)
C. John Ralph and Steven G. Fancy
Regional Analysis of Black-capped Vireo Breeding Habitats
Joseph A. Grzybowski, David J. Tazik, and Gary D. Schnell
Dispersal and Association among Common Ravens
Bernd Heinrich, Delia Kaye, Ted Knight, and Kristin Schaumburg
Book Reviews
Christopher W. Thompson
New Books in Ornithology
Christopher W. Thompson
News and Notes
The Condor
Covers
Back Matter (PDF)
The Condor
Front Matter (PDF)
The Condor
Short Communications
Determination of Nestling Age and Laying Date in Tengmalm's Owl: Use of Wing Length and Body Mass
B. G. Carlson and B. Hornfeldt
Behavior and Vocalizations of Gyalophylax and Megaxenops (furnariidae), Two Little-known Genera Endemic to Northeastern Brazil
Bret M. Whitney and Jose Fernando Pacheco