Contents
Evolution into the Andes: Molecular Evidence for Species Relationships in the Genus Leptopogon
John M. Bates and Robert M. Zink
Intrapopulation Variation in Hatching Synchrony in House Wrens: Test of the Individual-optimization Hypothesis
R. Given Harper, Steven A. Juliano, and Charles F. Thompson
Seasonal and Diurnal Patterns of Singing and Song-flight Activity in Bluethroats (luscinia Svecica)
Juha Meril
Fitness Consequences of Parental Behavior in Relation to Offspring Number in a Precocial Species: the Lesser Snow Goose
Tony D. Williams, Maarten J. J. E. Loonen, and Fred Cooke
Mitochondrial-dna Polymorphism in the Oilbird (steatornis Caripensis, Steatornithidae) in Venezuela
Patricia C. Gutierrez
Nocturnal Foraging Behavior of Breeding Piping Plovers (charadrius Melodus) in New Jersey
Kevin J. Staine and Joanna Burger
Territory-size Regulation in Black-shouldered Kites
Jeffrey R. Dunk and Robert J. Cooper
Development of Vocal Regulation of Temperature by Embryos in Pipped Eggs of Ring-billed Gulls
Roger M. Evans, Alison Whitaker, and Myra O. Wiebe
Site Selection by Migratory Shorebirds in Delaware Bay, and Its Relationship to Beach Characteristics and Abundance of Horseshoe Crab (limulus Polyphemus) Eggs
Mark L. Botton, Robert E. Loveland, and Timothy R. Jacobsen
Breeding Patterns of Eastern Phoebes in Kansas: Adaptive Strategies or Physiological Constraint?
Michael T. Murphy
Individual and Species Preference in Two Passerine Birds: Auditory and Visual Cues
K. L. Schimmel and Frederick E. Wasserman
Cause and Effect in Population Declines of Migratory Birds
John H. Rappole and Mary Victoria Mcdonald
Mitochondrial-dna and Nuclear-gene Differentiation in North American Prairie Grouse (genus Tympanuchus)
Darrell L. Ellsworth, Rodney L. Honeycutt, Nova J. Silvy, Kevin D. Rittenhouse, and Michael H. Smith
Interspecific Defense of Pasture Trees by Wintering Yellow Warblers
Russell Greenberg and Javier Salgado Ortiz
Flight Morphology, Energetic Condition, and the Stopover Biology of Migrating Thrushes
Wang Yong and Frank R. Moore
Intraspecific and Geographical Trends in Body Size of a Differential Migrant, the Evening Grosbeak
David R. Prescott
Covers
Front Matter
The Auk
Back Matter
The Auk
Short Communications
Serrate Tomia: an Adaptation for Nectar Robbing in Hummingbirds?
Juan Francisco Ornelas
Divergence in the Mitochondrial Dna of Empidonax Traillii and E Alnorum, with Notes on Hybridization
Kevin Winker
Supplementary Food in the Nestling Phase Affects Reproductive Success in Pied Flycatchers (ficedula Hypoleuca)
Simon Verhulst
Allozyme Phylogeny of Spheniscus Penguins
W. Stewart Grant, David C. Duffy, and Rob W. Leslie
Sexual Size Dimorphism, Mate Choice, and Productivity of Burrowing Owls
David L. Plumpton and R. Scott Lutz
Male Yellow Warblers Vary Use of Song Types Depending on Pairing Status and Distance from Nest
Daniel M. Weary, Robert E. Lemon, and Stephane Perreault
Different Responses to Different Song Types in American Redstarts
Daniel M. Weary, Robert E. Lemon, and Stephane Perreault
Response of Male Brown-headed Cowbirds to Broadcast of Complete or Partial Flight Whistles
Alfred M. Dufty Jr. and James K. Pugh
Extrapair Paternity and Intraspecific Brood Parasitism in Eastern Bluebirds Revealed by Dna Fingerprinting
Susan B. Meek, Raleigh J. Robertson, and Peter T. Boag
Impact of Interspecific Aggression and Herbivory by Mute Swans on Native Waterfowl and Aquatic Vegetation in New England
Michael R. Conover and Gary S. Kania
Siblicide and Cannibalism at Northern Goshawk Nests
Clint W. Boal and John E. Bacorn
Gastroduodenal Motility and Glandular Stomach Function in Young Ostriches
A. Allan Degen, Gary E. Duke, and James K. Reynhout
Hummingbirds Eating Ashes
James R. Lauriers
Habitat-specific Nutritional Condition in Loggerhead Shrikes (lanius Ludovicianus): Evidence from Ptilochronology
Thomas C. Grubb Jr. and Reuven Yosef
Does the Early Common Raven Get (and Show) the Meat?
Bernd Heinrich