V. Memmler 1943 Perognathus californicus June 17, M.V.Z. mice could dig a burrow if they desired to do so. Up until now the soil has been too loose & dry to stand in shape when dug. The mice have frequently and almost frantically tried to dig in this loose soil, but it has always caved in on them. A trench was dug to give the mice the idea of digging but they did not seem to catch on to the idea for a few minutes. Finally after about 10 min. Pat started to dig in the end of the trench. She would dig straight in front then lying on her side she would dig to one side, then turning over on her other side she would dig on that side. When there was too much dirt in the hole she would come out head first, pushing dirt ahead of her nose & front feet. This did not get enough dirt out of the hole for her, so she would go (away from the hole) to the far end, off the pile of dirt thrown out, and begin to dig. thru this loose dirt toward the hole, clearing a path to the hole as she went. As she neared+ entered the hole the entrance was cleared of the soil she had pushed out in front of her nose. Mike joined Pat in the digging in about 5 min. When they had dug for about 15 min., they closed the entrance by pushing dirt from