In crossing the bay ice, the animals traveled habitually in long files, one after the other, and yet not altogether in single file. In watching the endlessly interesting spectacle from camp, we could not always count the individuals exactly, for here and there a few would get abreast of others and be partly concealed. The general formation of each band was that of a much strung-out procession. For the most part the animals progressed at a moderate walking gait; there were no flies to spur them on at this season. On one occasion the forward element of a large band was actually running, but those in the rear were going calmly, and there was no visible cause of alarm. At mid-morning of June 6 most of a band of 25 were lying down to rest on the bay ice, while a few remained standing.
Meanwhile Caribou in some numbers were advancing northward by crossing Windy River, the ice on which did not break up generally till June 14. On June 3, for example, as I peeped out of my tent at 4 a.m., there was a band of about 15 making a crossing a quarter of a mile above camp. Late in the afternoon several dozen did likewise close to the same place. At this period I did not get farther upstream to note how many might be passing there. On June 14, while the river ice was breaking up but while the bay ice was holding firm, two bucks moved about on the latter, just off the river's mouth. They appeared to be seeking a safe crossing. The smaller of the two almost invariably preceded, just as if it were aware that it would be less likely to break through than its companion. For the most part they walked rather sedately, but now and then took up a very leisurely trot. On the following day a dozen crossed Windy Bay at about the same place. These were the last ones seen on the ice in June. Though the ice remained on the bay for some days longer, it had evidently become unsafe.
Thereafter the Caribou obviously preferred the short passage of Windy River (no more than 50 or 60 yards wide in places) to a swim of half a mile or so across Windy Bay. So they appeared in considerable numbers on the south bank of the river, reconnoitering for a suitable place to cross. Many were deterred by movements or sounds in our camp on the north bank, including the yelping invariably set up by the tethered Husky dogs whenever they would catch sight of Caribou; the latter would then be likely either to retreat behind the ridges or to pass upstream along the south bank. Along the half-mile extent of this bank visible from our camp, I noted the following making the passage of the river by swimming: June 18, a band of half a dozen; June 20, a band of three landing practically in our dooryard and about 14 crossing at the mouth; June 21, six crossing at the mouth; June 24, about 10 (mostly big bucks) landing just above the camp. On the morning of July 1 a buck swam across the bay just off the river's mouth, and a little later a band of about 11--the last seen on the spring migration--were trotting upstream along the south bank.