The recent talk of ultrasonic tarsiers reminded me of a post I wrote a couple years ago. You see, tarsiers aren’t the only animal to communicate at a sound frequency beyond the level of human hearing: mice do as well. But, for some reason, some mice actually chatter in such a way that they can be heard by humans. While most mice are ultrasonic , as far as I can tell there’s no good explanation for why some mice are…sonic. But this story begins one hundred years ago, in 1912, likely well before anyone knew about ultrasonic communication in mice. Sometimes, when trolling…