Greene, H. 1983 25 June (continued) and then descended w/out problems. ≈0800 hr Isidro returned to lead me to a Bradypus griseus. The sloth was curled up under a low shrub by the path to Rafael's house, where it meets East River Rd. Big flies in it, fur, so I thought it dead - but touched it w/ my foot and it wheeled around. Seems OK. Little Lachesis was in same spot ≈1030 hr, but at ≈1130 had moved ≈10m N and recoiled. An obvious crate where it has sat for last few days. Went to a new tree fall at ≈360 m on the Camino Experimental Sur - took photos and saw several Cebus monkeys. This morning when we watched the big Lachesis crawling behind the Bath House I noted two landmarks on the ground, and later found the distance between them to be 2.1 m. 26 June Checked small Lachesis off and on all day. Went for float in the Rio Puerto Viejo before lunch and the Rio Sarapiqui after lunch. In late morning, Manuel went up on the canopy platform and saw an adult Pseustes up there (≈40m above ground). At ≈1845 (after dark) caught a ≈65 cm Micrurus nigrovinetus crawling in leaf litter beside sidewalk behind Bath House. At thrashvol, tail displayed, and snapped repeatedly when pinned. Paired off and on all night. Frogs calling here and there, and I spotted