In the winter bats hibernate in the cave in large numbers. In April when we visited Penn’s Cave they were all gone – all except one 🙂 The tiny guy was hanging from the ceiling, still deeply asleep. The guide pointed him out briefly, but did not want to disturb him unnecessarily. The cave is connected with the lake at the end. The beaver comes to the cave as well – when all the tourists are gone for the day and the evening approaches, he sometimes spends the night there. Occasionally an owl may fly in for the night, but it stays close to the entrance.
Some of the formations in the cave are illuminated, and the colors change. It is rather nice, although for me too commercial. I would prefer the colors of the rock. But since even weddings are organized in the cave, I understand they want to beautify it as much as possible.