Pe eA Sh CaN eRe lla 1 1 ON 33 
White-Breasted Nuthatch (1) AOU 727 
Two young in nest, June 22, McHenry Co. 
House Wren (84) AOU 721 
Nest building was generally in early and mid-May. Clutch size 
varied from 5-8 (av. 6). Late nesters brought off young as late as 
August 20. Peak incubating was June to mid-July. Varner reported 
a clutch of 8 eggs, May 14, Adams Co. This is a repeat of an early 
nest in same nest box. 
Catbird (4) AOU 704 
Four nests of 4, May 28, Cook Co. 
Brown Thrasher (6) AOU 705 
Five clutches, 1st hatching June 24, Lake, Bureau, DuPage, McHenry 
counties. 
Robin (32) AOU 761 
34 nests, averaging 3 eggs. Earliest hatching May 5. McHenry, 
Macon, Cook, Bureau, DuPage, Richland, Christian, Winnedago 
counties. 
Wood Thrush (1) AOU 755 
One clutch of 3 eggs June 20; 2 hatched June 26, 1CooknGo: 
Eastern Bluebird (112) AOU 766 
Most clutches 4-5 eggs, usually fledged 3-4 young. Eggs were re- 
ported from nests as early as mid-April and as late as July. Young 
were still in a few nests in August. The peak for nesting is the 
month of May (about 80% of the egg counts were from this period). 
Almost all nests were in nest boxes. Mostly Adams, Montgomery, 
Christian and McHenry counties. 
Loggerhead Shrike (1) AOU 622 
Three young, June, Richland Co, 
Starling (3) AOU 493 
First eggs April 27, McHenry Co. 
Yellow Throated Vireo (1) AOU 628 
Two young, July 25, Cook Co. 
Red-Eyed Vireo (1) AOU 624 
One nest, incubating June 18, McHenry Co. 
Yellow Warbler (1) AOU 663 
One egg, June 5, Lake Co. 
American Red Start (2) AOU 687 
Both with cowbird eggs and abandoned. July 19 and 25, McHenry Co. 
House Sparrow (59) AOU 688 
First eggs reported mid-April. Clutch size varied but usually 4-6. 
Because most observers destroyed the eggs, nests or young, the 
validity of most of the individual observations is questionable. Nest- 
ing activity continued through June. 
Eastern Meadowlark (1) AOU 501 
One clutch of 5 eggs, May 25, Richland Co. 
Yellow-Headed Blackbird (2) AOU 497 
Two nests, 3 and 4 eggs, in July, Lake Co. 
