As of today, in season, building toward peak (~July 1). Earth Exhibit tracks the live conditions and flags it the moment it is on.
At dusk on summer evenings, the Historic Entrance to Mammoth Cave, the mouth of the longest known cave system on Earth, comes alive as bats pour out into the Kentucky twilight to hunt insects over the forest.
Mammoth Cave preserves more than 400 surveyed miles of passages, and that vast underground network shelters bats that emerge nightly through the warm months, funneling out of the cave entrance in a ribbon of wings against the fading light.
The park turns this nightly event into a living science demonstration: along the River Styx Trail near the Historic Entrance, biologists and bat interns set up with night-vision goggles, infrared thermal cameras, acoustic monitors, and mist nets, showing visitors exactly how researchers track, count, and assess the health of bat populations, work made urgent by white-nose syndrome, the fungal disease that has devastated North American bats.
The park's annual Bat Night gathers crowds for hands-on demonstrations from roughly 7 to 9 PM, but ranger-led summer evening programs offer the experience more broadly.
Watching bats spill from the entrance to the world's greatest cave while scientists reveal them on glowing infrared screens turns a fleeting natural moment into an understanding of how these animals live, and why their survival matters.
Where to see it
A taste of where to see it. The full map, exact coordinates and the best timing for each spot live in the app.
| Viewing spots |
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| Historic Entrance & River Styx Trail |
This is the short version
This page shows a taste. The app has the full list of where to see this, the exact timing, and live conditions for 1,000+ natural phenomena worldwide, so you know the moment one is genuinely worth the trip.