ILLINOIS AUDUBON BULLETIN 
Published Quarterly by the 
ILLINOIS AUDUBON SOCIETY 
Number 175 Winter 1975-1976 
CONTENTS 
THE PRESIDENT’S MESSAGE Peter Dring Js 
THE ILLINOIS NATURE PRESERVES SYSTEM: 
WHAT IT IS HOW YOU CAN HELP Richard Thom 4 
THAT BOOK, THE RIVER Mike Conlin 10 
BIRDERS AND ECOLOGY Donald S. Heintzelman TZ 
A HELPFUL MIND—SET TO KNOW THE BIRDS 
BY SOUND Don L. Danielson 15 
MARIE MAYFLOWER REMEMBERS Marie Nilsson 18 
WHAT'S IN THE FUTURE FOR CORMORANTS? Vernon M. Kleen DA 
ROSALEE COMMENT HERON SANCTUARY 1975 CENSUS 
Lucas Wrischnik es: 
A BLACK RAIL IN SUMMER IN CENTRAL ILLINOIS 
H. David Bohlen 25 
FIELD NOTES, BREEDING SEASON Vernon M. Kleen 26 
BOOK REVIEWS 33 
DICTIONARY OF BUTTERFLIES AND MOTHS IN COLOR By Allan Watson and 
Paul E.S. Whalley 
TO SAVE A BIRD IN PERIL By David R. Zimmerman 
THE INDIGENOUS TREES OF THE HAWAIIAN ISLANDS By J. F. Rock 
ENERGY FOR SURVIVAL By Wilson Clark 
GUEST EDITORIAL: CRICKET SINGS SECURITY SONG 
Le Roy Lintereur a8 
Upcoming Events 
Apr. 30 - May 2 Annual I.A.S. Meeting, Lakeview Center 
Auditorium, Peoria 
May 8 Statewide Spring Bird Count 
May 14-16 Conservation Conference [V, Oregon 
June | - 30 Period for Breeding Bird Surveys 
FRONT COVER: Double-crested Cormorant nesting site. See 
story on pages 20-24. 
