Hikers hear growl, wood knocking, have rock thrown at them witnessed in Benton County, Oregon

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While on a hike during this nice sunny day, I heard a low grumbling sound. My husband was leading me along the trail and he did not hear this sound. I stopped him and described the sound to him as a sort of "wild boar" type sound. It was VERY hard to describe. The sound was low, deep, like a vibrating growl or snort. We looked around and listened. When we didn't hear anything for quite a few minutes, we began walking again. Not more than 3 or 4 steps down the trail we hear a rustle noise and I quickly turned to see a rock or something rather large, dark and round fall to the ground with a large THUMP! The item had landed just where I was standing only a moment before. My husband heard this large item hit the ground and we stood stunned for a moment trying to figure out where it came from. I looked around the area and found a rock about the size of a baseball sitting where the item had hit the ground. My husband and I could NOT figure out where it had come from. Was a rock in the tree a...