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Jus,

I've had experiences similar to that too! When I lived in a house (and not on the bottom floor of an apartment building) I would hear a very loud thump, and then what sounded like a human or small pony running up and down the length of my roof. It took a while for me to finally figure out what it was... my cat. Yes, my 18 lb cat was heavy enough that when he climbed up a tree and landed on the roof, it actually sounded like a person stomping around up there. I wonder if you have neighborhood cats climbing that pecan tree and landing off on the roof?