Thompson Carlsbad Caverns April 25, 1931 Dip down bat cave with G.M. The cave is approx. ½ mile long 100 ft. wide and from 50-250 ft. high. The guano has been removed, the last being taken out in 1925. It covered the floor on an average of 8 ft. deeper over most of the area, and in some places 100 ft. deep. At present there were new fresh scatterings over about half the length of the cave but very sparse. About ¼ mile in the cave, we began to hear bats squealing up in the vault crevices, fully 100 ft above the floor. Our lights were too dim to see them. This one spot was the only place where we heard them. Three shafts enter the cave from above letting a small amount of light down. They are approx. ¼ mile apart. The last one is at the rear of the cave. But the cave is so dark, we could not see without our lights. In this end of the cave we found 3 species of spiders (one black with a red dot in the middle of its back, one a “granddaddy long-legs,” and one very small spider); large green