Contents
Notes and News
The Auk
Plumage Pigment Differences in Manakins of the Pipra Erythrocephala Superspecies
Jocelyn Hudon, A. P. Capparella, and Alan H. Brush
Search-path Characteristics of Foraging Ruddy Ducks
Michael W. Tome
Characteristics, Use, and Significance of Two Singing Behaviors in Grace's Warbler (dendroica Graciae)
Cynthia A. Staicer
The Natal Dispersal of Ruffed Grouse
Robert J. Small and Donald H. Rusch
Gastric Emptying and Gastrointestinal Motility in Leach's Storm-petrel Chicks (oceanodroma Leuchorhoa)
G. E. Duke, A. R. Place, and B. Jones
Reproductive Activity of Force-paired Cockatiels (nymphicus Hollandicus)
J. T. Yamamoto, K. M. Shields, J. R. Millam, T. E. Roudybush, and C. R. Grau
Conditions and Significance of Night Feeding in Shorebirds and Other Water Birds in a Tropical Lagoon
Michel Robert, Raymond Mcneil, and Alain Leduc
Nest-site Tenacity and Patterns of Adult Mortality in Nesting California Gulls (larus Californicus)
Joseph R. Jehl Jr.
Relationships of Steroid Hormones and Polygyny to Territorial Status, Breeding Experience, and Reproductive Success in Male Red-winged Blackbirds
Les D. Beletsky, Gordon H. Orians, and John C. Wingfield
100 Years Ago in the Auk
The Auk
Geographic Variation of Group Size, Ontogeny, Rattle Calls, and Body Size in Aphelocoma Ultramarina
Jerram L. Brown and Eric G. Horvath
Pitfalls and Improved Techniques in Avian Parentage Studies
Linda Romagnano, Terry R. Mcguire, and Harry W. Power
In Memoriam: Ralph W Schreiber, 1942-1988
Glen E. Woolfenden
In Memoriam: Betty Carnes, 1905-1987
C. Stuart Houston
Covers
Front Matter
The Auk
Back Matter
The Auk
Short Communications
Flight Speeds and Energy Requirements for White Ibises on Foraging Flights
C. J. Pennycuick and Toni De Santo
The Taxonomic Status of the Small Ground-finch, Geospiza (aves: Emberizidae) of Genovesa Island, Gal
Joseph Vagvolgyi and Maria W. Vagvolgyi
Homing Experiment with Leach's Storm-petrels
Elizabeth Cary Pierson, Charles E. Huntington, and Nathaniel T. Wheelwright
Sex Differences in Risk-taking Behavior in Foraging Flocks of House Sparrows
Randall Breitwisch and Joann Hudak
Commentaries
Response: Evolution of Sexual Size Dimorphism
Joseph R. Jehl Jr. and Bertram G. Murray Jr.
The Study of Geographic Variation
Robert M. Zink
Response to R M Zink
J. D. Rising
Response to P R Ehrlich, D S Dobkin, and D Wheye
Eloise F. Potter