M.Brock 1958 June 24 Mustela nivosus Barrow, Alaska Pete Savolak, Tom Cade and I went out to the area just north of transect IX, which is an area showing high winter usage by lemmings, judging by the lay and lemming nests present. While there, Pete saw a whitish animal run past on a tall mound of dirt. We started digging in the lemming tunnelway and soon a must appeared at another opening. After some digging and chasing, we captured the brown and white animal alive. He has been brought back to the lab and been placed in an aquarium. Two longspurs (dead) were placed in the aquarium and without much hesitation he started eating these. July 7 Four days ago, on July 3, a white laboratory mouse was placed in with the weasel. It was expected, of course, that the mouse would last, at the very most, five minutes. The two animals smelled one another disinterestedly for just a short while and then parted. Today, four days later, the mouse is still alive. The mouse bothers the weasel more than vice-versa. The mouse often follows the weasel trying to sniff it. One reason for the mouse still being alive, lies in the fact that the weasel