I heard a buzz sound periodically, but thought it was not so unpleasant for a human being.
I didn't realize what this device worked for in this open mountain.
There is a thing looking like cowhide which came off from the water bottom.
Never have I seen such a mysterious thing. I posted a monochrome picture, because it was an unpleasant color.
A surveillance camera has been installed in a forest. When the camera detects an animal with an infrared sensor, the camera record it by moving image. Not to mention a wild animal, my behavior is recorded also.
I found a pair of comma-shaped eggs of salamander at the small stream in the inmost abolished field. Their biotope is threatened. I wish they would be hatched safely and their descendant would be prospered.