I'm curious about animals other than humans. Once I was waiting for a call by a window, there was a generous spider on the other side. As I'm very afraid of spiders, I was looking at it while waiting for that call to arrive, it was very calm, barely moving. As soon as the call showed on the screen, silent mode on, no sound or vibration, the spider got completely mad, moving around like crazy so I moved away and the spider stopped moving again. I did experiment moving closer and away repeatedly with the same result. So maybe spiders are sensitive to that frequency?