Reithrodor (cont.) 11/12 2 am E Est. Perito Moreno. Firelighting from dark (9:30) to 11:45 must have seen a dozen Reithro, including 3 within 3 m of each other. Heard no sound but they seemed to know when the others were. Weedy, open green grazed, and around Berberis dumps all good. Several instances of multiple capture at one hole or runway including two traps that caught 3 individuals successively. Two traps caught Culexomp first followed by Reithro. The distribution of holes is certainly Patchy; clustered. The quantity and distribution of droppings is phenomenal. In the open, grazed, green area south of the RR there is hardly a square meter without a few droppings, even if no burrows are nearby. No evidence of plugging of burrows. Our 4 traps baited with fresh dandelion flowers and/or rabbit chow (alfalfa) caught overnight 22 Reithros, 5 Culexomp, 7 Culexomp, and 1 live tucan-tuco. There were 15 cage traps, 10 hole traps (hole in bottom for setting over Reithro hole), and 15 steel traps (not baited). All set for Reithro. The steel traps were most effective (15 Reithros to 7). The habitat consists of an elevated railroad embankment and trapline with parallel fences 2 dm on each side. Fresh lush grass between the fences with scattered Senecio, thistle, Berberis, Cosium. Outside the fences is grazed bunchgrass/ Senecio/thistle or closely cropped green turf with scattered bunchgrass and quercus in some places.