I am glad that I have found some supporters, given the initial reaction by some, who I do not doubt are grappling with the "how" of the situation just as I have. If you really want to make this discovery you can simple google earth the sighting in and around Chicago or any other area, and zoom and pan a little and you find that there are definite pathways that correlate sightings. You have to couple this with the knowledge that these are probably the stealthiest variety of the creature, only operating in the 11am-4am time frame, unless something forces them out in the daylight. I think there are only small numbers that travel the area from area to area leaving little trace, and make all attempts to not be seen or heard. I have been working on possible habituation, but I truly have doubts as to whether they stay for any period of time, though I first heard them on the fourth, and then also on the 12th of July. Something I also failed to mention, is the marsh that borders my yard is home to a heron rookery, also a rare situation, and puts off a buzz of heron sounds, none of which could ever be remotely confused with what I heard.
I am skeptical by nature, but I have no other explanation for what I heard, and I would like one if you can convince me another animal can match the whoops heard on Stan Courtney's bigfoot sounds (Whoop #1 and #3) My wife and I have been birders for quite a while, so I have a pretty solid ear to identify almost all the bird, migrating, or staying. I have spent weeks at a time camping in remote areas bordering Canada and Minnesota, and was born in Northern Wisconsin, yes a cheesehead, and I have seen other rare animals during those experiences, but nothing has come close the experience of hearing those sounds just outside my window, but mind you, they were coming from ground level, and moving away from the road and into the marsh, my senses were very alert when the first Whooeeep Whoooeep occurred, and it sounded like a youngster asking the parent a question, like "What should I do", and the adult sounded like, "Go, Go" . The thing really made sense when I saw the cop shining his light, I knew that was the trigger, and I am thankful for it. Sometimes you just know beyond a doubt, and that was the case, I knew that could only be super human or primate. My wife was a volunteer for several years at the Brookfield Zoo, working close to the apes and monkey exhibits, and she can name every primate that walks the earth, and she know the whoop we heard together on the fourth of July was from a primate, either Human or Ape, and I said at the time if I heard them at Four in the morning I might think they were not human, forward 12 days to 3:50 am and imagine my feeling hearing those sounds so loud and clear, and knowing that just outside my window, though hidden by a garage, stood the earths most interesting creature....