Pearson 1984 74 Reithrodon auritus Nov. 11. Estacion Perito Moreno (2 km E). Caught 3 juv. Rattler last night in the lush green grassy Berkeley between the fence (Estancia La Troque) and the RR; I caught by hand at 8 pm (broad daylight) trying to enter the hole where I was setting a trap; one at 10 pm emerging from a hole where I had set two cage traps (I marked up with flashlight and pushed him into one of the traps); a juvenile; and another juvenile in an open floor trap between 10:30 pm and 1 am. Night clear, calm & frosty. Ear-tagged the 2nd one (#4713), dusted it with fluorescent powder, and with UV light watched it hop slowly about 2 m through the grass. Soft lines for 20 min and when I returned he had gone another m, and was still visible and tranquil. At 1 am, he had gone another 2 m and the trail ended in a small clump of dried Sarcoia stalks with a good hole about 2 m away. In the evening excavated about 8 m of this tunnel, but found no more, no nest. Excavated 3 other burrows about 3-4 m each, found one nest (grass), no mouse. As captives, the 2 juveniles and 1 male troquil, ate only grass seed heads and maybe flowering Polygonum, not apple or oats. When put together they immediately scuffled and went to sleep for the first time. Slept seated after dark. Nov. 12 Overnight at enormous quantity of green grass blades, seed heads, maybe cullene, cooked carrot, sampled a pickled shiso They left cullene and green seed husks. In 24 hours in captivity the two of them produced 493 droppings =