Traveler sleeping at rest stop near Malad City awakened by possible wood knocks witnessed in Oneida County, Idaho

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While traveling from Herriman UT to Rexburg Idaho, I stopped for the night at the Cherry Creek rest stop off I-15 just before Malad Idaho. I parked in the "Truck" area as close to the mountain and as far from the restrooms as I could. I fell asleep in my pickup camper shell approximately 10:00 pm At 11:00 pm something woke me up, I sat up and looked around and saw nothing out of order, I could see very well due to the rest stop lights, I saw one big rig parked in the truck area and no cars at all. The truck may have awakened me when he pulled in. I laid back down and few minutes later I heard brush breaking a couple of hundred yards up the hill, I thought it must be a bear or an elk. Ignoring the breaking brush I tried to go back to sleep then while still awake I heard a clear distinctive wood knock, very clear like a bat on an oak tree. I listened for another half hour or so and heard occasional brush breaking, I then fell asleep. I was then awakened at approximately 3:00 am by...