Retired mail carrier reports sundown knocks and responses on east flank of Rockies near Calgary witnessed in Alberta, Canada

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I thought that I would send you a message about what happened to me last night. June19, 2018. I had decided to go out into Kananaskis country to take pictures of the setting sun behind the mountains. I had found a spot on Highway 66 where there was a pull out, so I could set up my tripod on firm ground. (pavement) I had gotten there earlier than I needed to so that I could prepare my equipment. As I was sitting in my car waiting for the right amount of sunlight I heard a wood knock but didn't think anything of it. (The car was turned off) I also heard a lot of birds. When I heard the second knock I thought ok 'what is that'. I then went to the back of my car and got out a baseball bat that I had in my vehicle. I then went and did a wood knock myself thinking 'Yea like I'm going to get a reply'. About 2 minutes later I got a knock, but it seemed to be a little closer. The first one was like 2 kilometers away and this one was about 1 kilometer away. I then went and hit a diff...