ILLINOIS AUDUBON BULLETIN 
Published Quarterly by 
THE ILLINOIS AUDUBON SOCIETY 
Number 179 Winter 1976-1977 
CONTENTS 
THE PRESIDENT’S MESSAGE Peter Dring 2 
REPORT AND RESULTS, 1976 SPRING BIRD COUNT Vernon Kleen 4 
ENDANGERED SPECIES: Keith Schreiner 14 
HABITAT ACQUISITION 
CRITICAL HABITAT 
RULEMAKING ACTIONS 
BIRD FINDING — LARUE-PINE HILLS Michael Morrison 20 
SOME GENERAL PROBLEMS OF FIELD IDENTIFICATION 
Lawrence Balch 22 
OBSERVATIONS ON BIRD-SQUIRREL INTERACTIONS 
Stephen Havera 27 
STATUS OF THE WHIP-POOR-WILL AND CHUCK-WILL’S- 
WIDOW IN SAND RIDGE FOREST, MASON COUNTY 
Dale Birkenholz & Thomas Marquardt 28 
1976 EASTERN BLUEBIRD NESTING REPORT 
Michael Morrison 30 
NESTING TRENDS AND HABITS OF NORTHERN HARRIERS 
AT GOOSE LAKE PRAIRIE, GRUNDY COUNTY © Dale Birkenholz 31 
FIELD NOTES, BREEDING SEASON Vernon Kleen 34 
COLONIAL BIRD REGISTER 
MID-JUNE BIRDING CHALLENGE 
BOOK REVIEWS 42 
INFORMATION BRIEFS FROM ERDA 44 
UPCOMING EVENTS 
29 Apr. — 1 May: I.A.S. Annual Meeting, Carbondale 
7 May: Statewide Spring Bird Count 
11-19 June: Mid-June Birding Challenge 
FRONT COVER: Bluebird nesting box made from half-gallon milk carton. Photo by 
Gary Thomas. 
