Contents
A New Species of Warbler (parulidae) from Puerto Rico
Cameron B. Kepler and Kenneth C. Parkes
Pollutant Concentrations in Abnormal Young Terns from Long Island Sound
Helen Hays and Robert W. Risebrough
A New Cretaceous Charadriiform Family
Joel Cracraft
Adaptive Mechanisms of the Raptor Pelvic Limb
George E. Goslow Jr.
Anatomical Evidence for Phylogenetic Relationships among Woodpeckers
William R. Goodge
A Chesapeake Barn Owl Population
Jan G. Reese
In Memoriam: John Roy Pemberton
N. Harrison and Jack C. Bloeker Jr.
Broad-winged Hawk Nesting and Food Habits
Donald H. Rusch and Phillip D. Doerr
Ovarian Growth in Tree Sparrows (spizella Arborea)
James V. Morrison and Fred E. Wilson
Proceedings of the Eighty-ninth Stated Meeting of the American Ornithologists' Union
Richard C. Banks
Periodical Literature
The Auk
Obituaries
The Auk
Notes and News
The Auk
General Notes
Courtship Feeding Calls in Gallinaceous Birds
A. W. Stokes and H. Warrington Williams
Further Examples of Dual Singing by Southwest Pacific Birds
Jared M. Diamond
Birds Nesting at the Kazan Falls
Frank L. Miller
Bigamy in the Bewick's Wren
Donald E. Kroodsma
Apparent Migratory Behavior in the House Sparrow
Maurice Broun
Digestion and Passage of Blue Mussels Eaten by Black Ducks
John W. Grandy IV
Feeding Interactions Between Pied-billed Grebes and Herons
Helmut C. Mueller, Mexeen G. Biben, and Harold F. Sears
Egg Measurements for Three Endangered Species
James D. Stephenson and Glen Smart
Breeding of the White-plumed Antbird (pithys Albifrons)
Edwin O. Willis
A Living Wild Turkey with a Feathered Head
Lovett E. Williams Jr.
A Behavioral Attitude of Saw-whet and Boreal Owls
Paul M. Catling
Use of Time-lapse Photography to Study Nesting Activities of Birds
Milton W. Weller and Dirk V. Derksen
House Sparrows in Guatemala
Walter A. Thurber
Covers
Front Matter
The Auk
Back Matter
The Auk