Contents
Geographic Variation in the Lesser Tree-swift
Kenneth C. Parkes
Behavior of the Inca Dove
Richard F. Johnston
Hybridization in the Anatidae and Its Taxonomic Implications
Paul A. Johnsgard
Sex Ratio of Nestlings and Clutch Size in the Boat-tailed Grackle
Robert K. Selander
Sexual Dichromatism in Two Species of the Columbidae
Wilmer J. Miller
Interrelations of Abert and Brown Towhees
Joe T. Marshall Jr.
Notes and News
The Condor
Covers
Back Matter (PDF)
The Condor
Front Matter (PDF)
The Condor
From Field and Study
Failure of Estrogen and Prolactin Treatment to Induce Breed Patch Formation in Brown-headed Cowbirds
Robert K. Selander
Elegant Tern and Royal Tern Nesting in California
Fred Gallup and Bernard H. Bailey
Occurrence and Breeding of the Golden-cheeked Warbler in Dallas County, Texas
Hal P. Kirby, O. M. Buchanan Jr., and F. W. Miller
Black-and-white Warbler and Purple Finch in New Mexico
Dale A. Zimmerman
Roadrunner a Predator of Bats
Clyde F. Herreid II
King Eider at Monterey, California
Laidlaw Williams and Richard T. Holmes
The Age of the Cave Swallow Colonies in New Mexico
Richard F. Johnston
The Rock Sandpiper, Another Northern Bird Recorded from the Cool Coast of Northwestern Baja California
Carl L. Hubbs
Condor Remains from Rampart Cave, Arizona
Loye Miller
Notes on Birds from Hart's Pass, Washington
Richard C. Bonks