Possible vocalizations heard by residents outside Elkton witnessed in St. Johns County, Florida

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This happened tonight. I had gone outside on the porch to have a cigarette about 9:00 pm and my two German Sherpards went out with me. I was outside about 2 -3 mins. when less then 100 feet from me just at the woods edge I heard a very loud yell/scream. My two dogs immediately jumped off the porch and took off towards the sound and I ran inside to get a shotgun and light. The dogs where running around sniffing the ground frantically but staying in the yard and not going into the wood. With my flashlight in one hand and gun in the other I went out into the yard and was looking around for a clue as to what could have made such a weird loud noise. Even though we live in the country we do have a few houses around us and the only thing that I could come up with is that it had to be some kid messing around and at that time I became mad and yelled " you might think messing around here playing games is fun but I'll tell you I have a gun and someone could very well get hurt messing ar...