Our Green Tortoise South Park Loop Trip, Sept., 1998. Where: Carlsbad Caverns. We arrive too late to see the caves, but in time to see the evening 'flying' of the bats. This is when all the bats (100,000's) come out of the cave all at the same time (dusk). Click on photos to see full screen view. The bus at Carlsbad. The passengers await the bats, with camera flashes TURNED OFF (said the ranger about 50,000 times). An mini-group photo. I guess we were bored. Must have been the bats.