In the latest “wolf weekly” report from Ed Bangs at USFWS, Ed wrote: Yellowstone Park researchers report that the summer predation study is going well. Approx 31 kills have been found May-mid through mid-July and they are 20 bulls, 5 cows, 5 calves, 1 mule deer. These data support the results of research done by following tagged elk calves [wolves killed few] and generally, but less so, scat analyses (scat analyses show more mule deer used in summer). Collar locations decrease from one every 30 min now to 8/day starting Aug. 1.
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I should say a bit more about this study. It is very important because all the quantitative data on wolf prey comes from winter observations when wolves generally have more of an advantage, and the ungulate composition in the Park differs somewhat from the summer when a lot of mule deer enter the Park from the Gardiner and some other areas.