My batty coworker

My co-worker is obsessed with bats. I don't know exactly when it happened, but wow: they fell hard. One week: regular conversations, or at least approaching regular. The usual detours, sympathetic complaining, mostly lighthearted, occasionally with actual work getting done in there somewhere. And then, out of nowhere, bats. All meetings must now by necessity begin with a short preamble on "bat facts". Details about these little critters are interspersed into chats throughout the day. I've seen pictures of many different types of bats, learned about echolocation in great detail, and heard stories about bats in the backyard, bats in boxes, and bats in attics. Apparently there is a device that can eavesdrop on bat echolocation and can identify the type of bat based on the frequencies. Or something like that, because how it actually works seems like some real science. I had no idea that there was a consumer market for this kind of not inexpensive device. My co-worker now owns one, of…