Greene, H. 1987 31 December hours at noon, lights off and on in the afternoon. as we started across the bridge at dusk for dinner, a Caluwny's derbianus was fairly running up a high cable on the bridge and then nimbly climbed off to an adjacent tree, where it descended out of sight in foliage on the South Bank of the Rio Puerto Viejo. I picked up the eye shine of an adult Caiman crocodilus near the north bank and slightly downstream, then saw it approach, contact, and move (bite) the dead iguana carcass. As we started up the bridge from dinner, saw a (the same?) C. derbianus rapidly scale a tree and run out a limb tip, turn back, and disappears into the foliage. I am repeatedly impressed that this opossum is more agile in trees than Didelphis. At 2000h we met for the Christmas Bird Count, and totaled 325 species! [Next morning the iguana carcass was gone, but I don't know if it was eaten or washed downstream. On 2 January 1988 I saw "short tail" in his old haunt, and now wonder if the dead lizard had washed down from upstream?]