Someone mentioned this could have been a coyote, which are plentiful around these parts of Illinois, but IMO, coyotes are not going to be out in the open when they sense humans approaching and just sit and look at them (unless it's rabid maybe?) Coyotes are normally active during the night. I've lived in Illinois all my life and I can count on one hand how many times I've seen one during the day, and it was because it was darting across the street to hide in the woods, or running away from someone. That is not a coyote.
I hope I don't see this when I go to BG either. I'd like to say I'd be strong and stand my ground but I also thought I could do that in a haunted house set up by the Jaycees at halloween and I pussified myself during that too he he
It's funny you guys mention the baboon thing. It made me think of the baboons going crazy when Damien went to visit them in the zoo in The Omen