El Karlstrom 1955 Buffo canorus Oct. 22 rock (B). Continued testing of all material dug up showed negative response with scintillometer. However, the high count (>550 c.p.s.) stayed above the V-shaped cleft formed by rocks A and B. Four of us had previously tried to lift rock A out without success. We did move it enough to peer under one edge when looking for the least weasel. My guess is that the food and/or pellet are below the edge of very large rock B. It was impossible to dig farther in this local area. The extent in depth of rock B underground. Weasels, microtus (most materials found under one 4 foot square granite slab) and other residents probably have made tunnels and runways under this pile of gigantic slabs. There are shrinkage places where the soil would pull away from the rock would offer good food retreats. There were no burrows or such where the C60 slug was dug up, but rock fragments were present. I suspect Buffo may do considerably more actual digging and enlarging of holes than commonly thought. It is hard to account for the slug being in such compact soil- root tangle on any other basis. But why pellet only found? There was no sign of a dead food, skin, etc. It seems unlikely that any predator carried the slug there.