 To be a bat researcher, to devote your life to these nocturnal riddles, you have to hope that in the narrow windows when you're out in the field, the specific kinds of bats that you want to study will fly into a net. That's why here, every afternoon for two weeks, there's a lot of anticipation in the air as the team fans out to trap bats in various locations. One afternoon, I join a group inside the nearby Lamini Archaeological Reserve.