We heard coyotes at dusk both nights, yipping far off somewhere. The camp sites were, thankfully, not crowded at all. But the Visitor Center sure was! The cave tours are very popular in the summer, one reason being that the temperature in the cave is a constant 53 degrees Fahrenheit year round. Probably most tourists are seeing other attractions and sleeping in town, only visiting the National Park for a few hours to tour the cave. We saw no one on the six miles of hiking trails that we covered. But we did see buffalo, prairie dogs, dung beetles, an elk pelvis, and lots of other signs of a vibrant biotic community.