Respiratory Gas Concentrations and Temperatures within the Burrows of three Species of Burrow-Nesting Birds (DjVu | PDF)
GEOFFREY F. BIRCHARD, DELBERT L. KILGORE, JR., , DONA F. BOGGS ,  451-456

Sexual Differences in Longevity of House Sparrows at Calgary, Alberta (DjVu | PDF)
W. BRUCE MCGILLIVRAY, EDWARD C. MURPHY ,  456-458

Seed Selection by Juncos (DjVu | PDF)
GAIL B. GOLDSTEIN, MYRON CHARLES BAKER ,  458-463

Food of Gyrfalcons at a Nest on Ellesmere Island (DjVu | PDF)
DALTON MUIR, DAVID M. BIRD ,  464-467

High Incidence of Plant Material and Small Mammals in the Autumn Diet of Turkey Vultures in Virginia (DjVu | PDF)
ROBERT L. PATERSON, JR., ,  467-469

Osprey Preys on Canada Goose Gosling (DjVu | PDF)
WILLIAM G. LAYHER ,  469-470

Pellet Casting by Common Grackles (DjVu | PDF)
DANIEL J. TWEDT ,  470-471

Preflight Behavior of Sandhill Cranes (DjVu | PDF)
THOMAS C. TACHA ,  471-477

Vocal Mimicry of Nashville Warblers by Yellow-Rumped Warblers (DjVu | PDF)
JOSEPH VAN BUSKIRK, JR., ,  477-482

Misdirected Displays by a Solitary Bird of Paradise in an Oropendola Nesting Colony (DjVu | PDF)
JOHN T. EMLEN, VIRGINIA M. EMLEN ,  482-483

Nest Spacing, Colony Location, and Breeding Success in Herring Gulls (DjVu | PDF)
RALPH B. SCHOEN, RALPH D. MORRIS ,  483-488

Nest-Site Selection and Breeding Biology of the Chipping Sparrow (DjVu | PDF)
JOHN D. REYNOLDS, RICHARD W. KNAPTON ,  488-493

Comparisons Between Single-Parent and Normal Mourning Dove Nestings during the Post-Fledging Period (DjVu | PDF)
RONALD R. HITCHCOCK, RALPH E. MIRARCHI ,  494-495

Nest-Sites of Turkey Vultures in Buildings in Southeastern Illinois (DjVu | PDF)
JOHN E. BUHNERKEMPE, RONALD L. WESTEMEIER ,  495-496

Nesting Distribution and Reproductive Status of Ospreys Along the Upper Missouri River, Montana (DjVu | PDF)
KARL E. GROVER ,  496-498

Molt in Vagrant Black Scoters Wintering in Peninsular Florida (DjVu | PDF)
WAYNE HOFFMAN, G. THOMAS BANCROFT ,  499-504