Living about 1 1/2 hrs drive straight south of Chicago,we seem to be directly under a very busy flightparh for the outbound jets heading south out of Chicago. Normally every evening I pop a bag of popcorn for the "group" and spend time with them. Tonight this routine was interrupted by tilling the garden but once that chore was done,the "group' came to the fence looking for their nightly popcorn "fix" which I didn't have. But while there at the fence I started hearing them start to make their shallow "alert" tone,and then all of them had their heads cocked sideways,with one eye looking upwards. Now when 34 peafowl all have their heads leaning sideways,with one eye skyward, I decided to see what all the fuss was about.It was then I noticed a silver speck,that of a southbound jet probably 25,000 feet up or more. After it was outta sight,,about 3 minutes later they all did the exact same thing again,as another jet flew over.Tomorrow night if there is no clouds I have to take my camera out and get a picture of this,,,68 eyeballs,all heads tilted with one of the two eyes looking upwards,,,it's funny they don't look "head-on" towards the jets,,rather cock their heads and use one eye to watch what has their interest. They must have amazing eyesight to notice and keep watching something almost silent and the size of a speck of silver sand. They do entertain easy tho..