There, H. 1987 13 July (continued) I have seen here! Up to this point it had been partly cloudy w/ frequent bright sun, but as we started back ~1020 hr, a hard rain started that didn't really let up til after lunch. 14 July Rained most of the day, so worked in lab. at 1600 hr went to S30 CES and found Lachesis muta under the Danaea fern. Set up Dan's remote photography stuff, only to find that for some reason it wouldn't fire. Started raining at ~1800 hr. At 1837 hr the Lachesis head appeared (by now it was virtually dark), and for 23:56 min 56 sec it crawled out into the area where it hunts, then back into the Danaea, then into the forest ~SE of its site. While crawling it frequently tongue-flicked, pointed its snout at the ground, and turn the head side to side. At least twice it lifted its head up a few cm to inspect low palm leaves. Thinking it would disappear, we caught it. When Dave and Dan went back for the can they caught an Oxyrhopus petola on the trail (~1930 hr, CES) -- said its only response to them was rapid crawling. As for the Lachesis hopefully we had the good fortune to see this snake initiate a site change. An alternative possibility is