This field trip to Nelson Dewey State Park was organized by the Natural Resources Foundation of Wisconsin, a nonprofit that works to protect the state’s lands, waters and wildlife. This particular group camped out to see the Stonefield colony of little brown bats as they emerged to feed at sunset. We were also there to witness the bats’ return as a swarm at dawn: all 3,000 of them. “It’s the beauty of morning swarm that we really want to be able to show people, and that’s why this field trip is