20 YH Es A\U'D U BiOiN Bil Loli ra igie 
An Illinois Heronry 
By Peter Petersen, Jr. and Norman Ward, Jr. 
There is a new location for the Lock and Dam 13 heronry near Fulton, I11. 
It is now % mile below Lock 13, about 100 yards from the river on an 
island. When we visited the area on June 18, 1966, we found 50-60 Great 
Blue Herons and 3 or 4 Common Egrets. 
Rock Island County Heronry — On July 9th we found that the Great 
Blue Herons seemed to make up 50% of the colony; there were only 10% 
last year. Common Egrets and Black-crowned Night Herons numbered 
about 25% each. These numbers are down from last year, especially the 
Night Herons. Several Green Herons probably nest on the fringe. I also saw 
one Yellow-crowned Night Heron, but no nest was located. A nest of this 
species with eggs was found June 19, 1966 at the mouth of the Wapsi River 
in Iowa. The fact that our visit was 10 days later than in 1965 may have 
affected population estimates. Colony size is about 200 nests. It is located 
142 miles west of the mouth of Rock River. 
Two probable Little Blue Herons, an adult and an immature, were 
seen July 16 over Andalusia Islands in the Mississippi River. 
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