The mission began at sunset. After a quick briefing to receive assignments and equipment, 26 staff and volunteers spread silently out to their locations. In the entrance breezeway, near the tram garage and underneath trees, they hunkered low on the ground as darkness grew. They waited, breath hushed. And then, with a chattering and creaking overhead, the mission began: The Great Trek Bat Count of 2018. As bats began to fly out from their roosts into the night to hunt, the humans sitting quietly below them began to click their counters, one for each outgoing bat. One staff member had …