Several hours later about 50 more Caribou passed through this bog. Then a band of 17 came along, composed chiefly of does and their fawns, with a couple of young bucks; they did not even turn their heads in my direction as I stood in the open 50 yards away. Eventually a herd of about 150 (the largest I saw during the whole season) passed along the well-worn trails on the summit of the Middle Ridge. It seemed to include all sexes and ages, with possibly a majority of does and fawns; bringing up the rear was a limping patriarch with huge antlers, a heavy mane, and a lingering winter coat. During the remainder of the afternoon several other groups appeared in that general area. About 15 individuals descended Little River Ridge (fig. 2) to the Eastern Bog, but retraced their course after coming close to several of us; they were mostly does, with four fawns and a few bucks. Another band, of all ages and sexes and numbering perhaps a hundred individuals, crossed at the rapid on Little River. The temperatures that had prevailed during this day’s marked migratory movements varied from about 45° to 50°. They were low enough to keep the black flies completely in abeyance, and the mosquito season was virtually over. Although I noticed none of the parasitic flies, possibly enough of them were present to keep the Caribou moving actively against a moderate to brisk northerly wind. Now and again a big buck could be seen fairly jumping out of its skin with the vigor of vibrating its sides to shake off the tormentors. On August 25 (the second day of the big movement) I watched and filmed the pageant of Caribou migration from the southwestern bank of Little River. The turfy slopes of the Barrens, carpeted with low ericaceous shrubs, mosses, and reindeer lichens, and dotted here and there with little thickets of dwarf birch, spruce, and tamarack, stretched invitingly before me. Temperatures ranging from 40° to 51°, with a brisk northwest breeze sweeping down the river, happily suppressed most of the black flies. The Caribou came along at intervals from the eastward, in bands up to 75 strong, either to make the passage of the river or to continue upstream along the opposite ridge. A small number might make the crossing in one or two files, but one of the larger bands might spread out widely in the shallow rapid. One of the photographs (fig. 7) shows approximately 75 Caribou going divergent ways at this rapid: about 20 passing upstream along the ridge on the far side, including some pausing to feed on the low vegetation; 8 or 9 moving down the slope of the ridge to the water’s edge; about 10 bucks, 16 does, and 6 fawns making the passage of the river; and about 13 arriving on the near shore and pausing to feed. The adults were able to step across in the swift water, while the fawns swam part of the way. The bucks were apparently in the minority again on this day.