Pigs. Some rat sized hystricomorph seems to live in the middle of big thorn clumps. Camped at 7 p.m. along the Rio Viejo Neuquen. Sandy hummocks with sage growth along the river, then rising to sage brush stony desert. Lots of rat-sized droppings in the middle of the sandy hummocks built around thorn bushes. All day was somewhat overcast. Oct 26 Night cleared up, minimum 33°. My traps ± 30 MS in scrubby sage caught 1 Eligmodontia; Acuto's in sandy hummocks caught 1 Oryzomyx and 5 Eligmus (including 1 tail only). She had 44 traps out including 10 Sherman. This location is the eastern crossing of the Rio Viejo Neuquen, 45 km 53E Churamal, south side of the river. I saw a colony of large rabbit-size hole and rabbit droppings, no tracks and no eyesight while jacklighting. Just before leaving we started to search over the hummocks with rat-dropping among the thorn-stems. A very large male thylactis ran out to a neighboring hummock; caught him by hand. Anywhere else? Left about 9:30 after shining. Saura rabbit newly dead on road about 20 miles farther south, a few miles north of Churriaca. Along the Rio Zoledo about 5 miles N of the R. Agrio we stopped and looked in a large mine west of the rd and a small mine east of the road. The latter had shows rat dropping on floors wall; a girl near the large mine said no rats, but yes in cliffs at the R. Agrio. The big mine was cool and would have been a good campsite some time (but too cool for nursery colony). Lots of rabbit signs along the R. Zoledo. Had lunch at the Rio Agrio and looked in "pitholes" and crevices in the cliffs for bats; saw only 2 places with a few