Green, H. 1989 April 5 (continued) close to the bridge, and responded to my presence by dropping so low as to be hard to see. at ~ 1330 hr today in bright sun I saw an adult ? (based on low battered spins on back), looking gaunt and very uniformly dark, basking on an emergent log on the north bank of the river. at 1915 hr John Derin took me to a juvenile Bothrops macutus (18g, ~270+42 mm, ?) that was sketched out in litter beside the arboratum trail. When touched w/ snake hook it made several wide, convulsive lateral swings, then paused. When picked up it writhed, expelled liquid from the cloaca, and tried to bite. A shower ~2100 hr. April 6 Rained hard again this morning before dawn. Sharon Emerson and I walked out the CES and Arajo (SAT) to a rock where Mat O'Brien and I have collected otter scats before. Light rain at ~0900, but hot sun by the time returned. At 0850 hr at ~SAT 200 m I spied a juvenile Bothrops asper in litter, crawling beside the boardwalks. It crawled rapidly to the underhang, and turned and bit my boot when restrained. Had a yellow tail, no food. Found three small piles of fresh lutra longicaudus feces on the rock at the south edge of the Rio Sarapiguiri. River so high and rough we didn't try to cross it. At ~1100 in the arboratum saw an adult Septodon cayensis perch high in a canopy and, always keeping its back to us, pecked repeatedly at something.