P. PEARSON 1950 34 of 12: up into a popalane hole. Somewhere between 20 and 40 bats fell in the river and owlings frisked out 16. Skinned until dark which came early down in the gorge (we are camped in the cave). At dusk and after, two hawk-like birds flew for perhaps ½ hour near the ceiling of the cave apparently hunting bats, sometimes being chased by large bats. These birds make a loud snapping sound as well as a raucous rattling cry. Other fauna of the cave are cockroaches as big as a Myotis and at least 1 species of small bat, also large flat spider and large centipede. July 28 Looked through the cave at sometime in the middle of the night. Still a hundred or more of the large bats (the 3210-3215) in their wake. Was surprised to find that their eyes shine. The hawks were flying in the cave before dawn - even with my eyes dark- adapted I could not see my hand in front of my face. The hawks were making a snapping sound as they flew, like a wooden rattlet, 5 to 10 clicks per second. Perhaps an echolocation mechanism. Many small parrots became apparent flying in and out of the cave after daybreak. Skinned until about 3 p.m., then went to the "grove" cave upstream. It too has a stream coming out of it and is very high. At the entrance a medium-sized pale bat was flying in and out, disappearing into the trees for a minute or two each time. Missed it several times. I made the cave