Hitch-hiker tells of his possible nighttime encounter along I-75 witnessed in Hillsborough County, Florida

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I was leaving saint petersburg with the intentions of hitch-hiking to asheville, nc. I had a friend drop me off at the I-75N XX exit around 11 pm. there was a lot of construction going on and since it was getting late I decided to camp for the night. I walked to the bridge that crosses the XX river. I was planning on sleeping under the bridge, I walked down underneath, got myself comfortable then I heard a couple of noises to the left of me (coming from the southbound bridge)I played it off as a possum or raccoon, then I heard it again.. so I decided to move closer to the river and hang my hammock in between two trees. I was texting people, then called my friend and talked to her until about 2:30 then we got off since my phone was about to die. I went to sleep pretty quickly afterwards... but not for long. I woke up to a noise down by the river to my left. it was a weird cough/grunt that I can't really explain. I can't mimic the sound but I only heard it once. 10-15 minutes later I hea...