I was sitting in my car awaiting my next uber/lyft call. i was parked on the side of the road near toll booth plaza 31 it is a spot many driver share drivers like to park to be close to the o'hare terminals, which allows us to pick up rides from the airport. as i was sitting there, fiddling around my car i saw something walk out of the trees. it was a tall creature about 6-7 feet tall and kind of hunched over. it walked with a sort of gait like almost a waddle. it was completely black when it swiveled it's head i saw two bright red eyes glowing. this thing opened a pair of large wings, as wide as it was tall and began to flap them. it took off and headed to the south toward that large indoor driving range and the baseball park. it was gone in a few seconds.