Shoshone Falls, Snake River, Twin Falls Co., Idaho. July 10. To forage grounds. Many of the burrows were under willow slashings along the canal bank. I saw several young which I could have taken, as I walked back and forth over this area, their low, yet high pitched, whistles could be heard in all directions. This whistle I believe is the alarm cry - warning to others, - and it is very deceptive. I tried the idea of trying to locate the squirrels by their whistles, but failed. I believe they give them while in the burrow, yet not back so far that they can't see out. I know this is the case with one I saw giving the whistle at Bridge, Cassia Co. I saw one young with its mouth filled to overflowing with shredded bark of the sage brush sitting up at the burrow giving the low whistle. The cargo seemed not to impede the power of whistling at all. This bark was doubtless for nest material. Arove on to Twin Falls, and then drove to a ranch about 1½ mi. S of here where I trapped for gophers without success. Had 5 sets out from 12:30 to 5:00 p.m. Two were filled with earth, the others un-touched. The burrows were small, as I