Produced by Chris Curnow, Joseph Cooper and the Online Distributed Proofreading Team at http://www.pgdp.net UNIVERSITY OF KANSAS PUBLICATIONS MUSEUM OF NATURAL HISTORY Volume 12, No. 5, pp. 241-296, 6 figs. March 7, 1962 Natural History of the Bell Vireo, Vireo bellii Audubon BY JON C. BARLOW UNIVERSITY OF KANSAS LAWRENCE 1962 UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY Editors: E. Raymond Hall, Chairman, Theodore H. Eaton, Jr., Henry S. Fitch Volume 12, No. 5, pp. 241-296, 6 figs. Published March 7, 1962 UNIVERSITY OF KANSAS Lawrence, Kansas PRINTED BY JEAN M. NEIBARGER, STATE PRINTER TOPEKA, KANSAS 1962 29-1506 Natural History of the Bell Vireo, Vireo bellii Audubon BY JON C. BARLOW CONTENTS PAGE CONTENTS 243 INTRODUCTION 245 ACKNOWLEDGMENTS 245 METHODS OF STUDY 246 STUDY AREA 247 Considerations of Habitat 248 SEASONAL MOVEMENT 250 Arrival in Spring 250 Fall Departure 251 GENERAL BEHAVIOR 252 Flight 252 Foraging and Food Habits 252 Bathing 253 VOCALIZATIONS 254 Singing Postures 255 Flight Song 255 Daily Frequency of Song 255 Types of Vocalizations 255 TERRITORIALITY 258 Establishment of Territory 259 Size of Territories 259 Permanence of Territories 260 Maintenance of Territory 260