Whooping in Jackson County, Missouri

Several times a week I go fishing at the James Reed Memorial Wildlife Area just south of Lee's Summit, MO. It's about 900 acres plus 10 lakes to choose from for fishing and a area with walking trails. Each lake has a level, mowed area about 20 feet wide all the way round it. It is wooded and brushy between lakes plus there are also open meadow/fields scattered around. Animal life is deer (lots of them), fox, possums, rabbit, racoon, squirrel, turkey, geese, golden eagles, cranes, vultures and many smaller birds. During the week there aren't many people there fishing so sometimes I'm the only one. I prefer fishing at the lake that is farthest from the main entrance. I think Google Maps shows it as #9 but it has a name. The first week of August, 2020, I was there fishing for bass and had worked my way half way around the lake when I came upon a very large pile of scat in the mowed walking area. It was well formed and shaped like human feces. I estimated its size as 16 X 14 inches and about 5 inches high. My first thought was an obese person had somehow managed to completely empty their guts. There are horse riders allowed in the area but I've never once seen their hoofprints around the lake in that area not any horse scat. The pile did not resemble in any way what a horse does. The last week of August, 2020, I was the only person there and there were no other cars in the parking lot. I was near where I'd seen the scat. When I fish I move slowly and quietly. I was on the southwest side of the lake when I heard what I thought was a hoot owl. It hooted three times with no space between hoots. I've never hear an owl do that. I walked and fished for another 100 feet or so and was facing the water when in the trees/brush behind me I heard a deep HumphGrrrr sound. Both sounds were ran together and I could feel it vibrate in my chest. I immediately turned completely around thinking that there was a huge dog nearby and I wanted to make sure it wasn't sneaking up on me. The sound lasted about 3 seconds and even after I couldn't hear it I still felt it vibrate in my chest for a few more seconds. I looked as far back into the trees/brush as I could and saw nothing. I wasn't scared but I felt that I needed to leave so I left and went home. I was there fishing on Sept 8 or 9, 2020 (can't remember which day this happened). Same lake, same time, about 11 AM. I was on the northwest side of the lake casting for bass and I was the only one there. Earlier there was a young man fishing but he left about 10 AM. Except for the occasional bird and locust it was quiet. Suddenly in the brush behind me I heard what I can only describe as a small chimp making sounds like Cheetah the Chimp. I would guess the source of it to be closer than 50 feet. I heard it for perhaps a second or two then it stopped suddenly like someone had flipped a switch. I turned completely around and looked as far back into the trees/brush as I could. I even looked up into the trees on both sides of me and saw nothing. I moved a little faster and quickly worked my way around the lake to the parking lot then went home. That was as weird as the owl and growl I'd heard. This place is about one half mile outside of a city which is a suburb of Kansas City, MO. I do not have any mental illness, I do not drink, do drugs or smoke. I am a retired University teacher. Do you or anyone else have a possible explanation of what I saw and heard? I am really curious and want to know. Now when I go fishing there I'm looking into the brush around me and up into the trees as I walk.