Contents
Frugivory and Polygamy in Birds of Paradise
Bruce Beehler
Spacing out at Mono Lake: Breeding Success, Nest Density, and Predation in the Snowy Plover
Gary W. Page, Lynne E. Stenzel, David W. Winkler, and Christopher W. Swarth
Notes and News
The Auk
Intraseasonal Reproductive Costs for the House Sparrow (passer Domesticus)
W. Bruce Mcgillivray
Endocrine Responses to Inclement Weather in Naturally Breeding Populations of White-crowned Sparrows (zonotrichia Leucophrys Pugetensis)
John C. Wingfield, Michael C. Moore, and Donald S. Farner
Sexual Differences in the Behavior of Adult Great Black-backed Gulls (larus Marinus) during the Pre- and Post-hatch Periods
Ronald G. Butler and Saskia Janes-Butler
Nest Microclimate, Water-vapor Conductance, and Water Loss in Heron and Tern Eggs
Carol Masters Vleck, David Vleck, Hermann Rahn, and Charles V. Paganelli
Hunting Behavior, Prey Selection, and Energetics of Snail Kites in Guyana: Consumer Choice by a Specialist
Steven R. Beissinger
Mollusk Predation by Snail Kites in Colombia
Noel F. R. Snyder and Herbert W. Kale II
Behavior, Morphology, and Systematics of Sirystes Sibilator (tyrannidae)
Wesley E. Lanyon and John W. Fitzpatrick
The Function of Singing in Female Black-headed Grosbeaks (pheucticus Melanocephalus): Family-group Maintenance
Gary Ritchison
Notes on the Behavior of the Costa Rican Sharpbill (oxyruncus Cristatus Frater)
F. Gary Stiles and Bret Whitney
Evidence for a Polyphyletic Origin of the Piciformes
Storrs L. Olson
Monophyly of the Piciformes: a Reply to Olson
Robert J. Raikow and Joel Cracraft
Why Do Brown-headed Cowbirds Perform the Head-down Display?
Thomas W. Scott and Judith M. Grumstrup-Scott
Time and Energy Budgets of the Mockingbird (mimus Polyglottos) during the Breeding Season
Douglas W. Biedenweg
Harlan's Hawk (buteo Jamaicensis Harlani): a Valid Subspecies
David P. Mindell
Adaptations of the Gray Catbird Dumetella Carolinensis to Long Distance Migration: Energy Stores and Substrate Concentrations in Plasma
Richard L. Marsh
Variability in Island Populations of the House Finch
Dennis M. Power
In Memoriam: Eugene Eisenmann
John Bull and Dean Amadon
Brewster Award, 1982
Robert E. Ricklefs
Covers
Front Matter
The Auk
Back Matter
The Auk
Short Communications
Helping at the Nest in Darwin's Finches as Misdirected Parental Care
Trevor Price, Stephen Millington, and Peter Grant
Avoidance of Venomous Sea Snakes by Naive Herons and Egrets
Gloria Sullivan Caldwell and Roberta Wolff Rubinoff
Winter Distribution of Subspecies of Clapper Rails (rallus Longirostris) in Florida with Evidence for Long-distance and Overland Movements
Robert L. Crawford, Storrs L. Olson, and Walter Kingsley Taylor
Assortative Mating by Brant
Kenneth F. Abraham, C. Davison Ankney, and H. Boyd
Natal and Juvenal Plumages of the Blue-and-white Swallow (notiochelidon Cyanoleuca)
Keith A. Arnold, Eva Jolene Boyd, and Charles T. Collins
Postnuptial and Postjuvenal Molts of Red-winged Blackbirds in Cass County, North Dakota
George M. Linz, Susan B. Bolin, and J. Frank Cassel
Female-female Pairs and Polygynous Associations in a Qu
Marie-Christine Lagrenade and Pierre Mousseau
A Record of the Siberian Flycatcher (muscicapa Sibirica) from Bermuda: an Extreme Extra-limital Vagrant
David B. Wingate
Incidental Ingestion of Cassin's Auklets by Humpback Whales
William F. Dolphin and Daniel Mcsweeney
Does Sex Ratio Vary with Egg Sequence in Lesser Snow Geese?
F. Cooke and R. Harmsen
Effects of Intraspecific Piracy on Breeding Ring-billed Gulls
Sue F. Elston and William E. Southern
First Record of the South American Pochard in Central Brazil
Paulo De Tasrso Zuquim Antas and Susana De Moura Lara Resende
The Magellanic Penguin (spheniscus Magellanicus): Sexing Adults by Discriminant Analysis of Morphometric Characters
Jose A. Scolaro, Martin A. Hall, and Isaias M. Ximenez
Commentaries
On Sightings and Specimens
F. Gary Stiles
Do Darwin's Finches Lay Small Eggs?
D. M. Scott and C. Davison Ankney
The Relative Size of Darwin's Finch Eggs
P. R. Grant
Further Notes on Variation in Leach's Storm-petrel
David G. Ainley
Evidence for Hybrid Murre Reconsidered
Ronald Sluys