. The Canadian field-naturalist. 1963 Blood: Behavior of a Bighorn Herd 79 WINTER RANGE BOUNDARY SUMMER RANGE MIGRATION ROUTE. UNITED STATES Figure 1. Alap showing seasonal bighorn distribution and migration routes in the Ashnola region. Winter range outlined is the maximum area used from November through May. Summer range areas shown are regions of intensive summer use and are not likely the maximum summer range. size. Three- and four-year-old rams could also be aged fairly accurately by horn size, however no attempt was made to determine age of rams older than four years. To obtain daily act
. The Canadian field-naturalist. 1963 Blood: Behavior of a Bighorn Herd 79 WINTER RANGE BOUNDARY SUMMER RANGE MIGRATION ROUTE. UNITED STATES Figure 1. Alap showing seasonal bighorn distribution and migration routes in the Ashnola region. Winter range outlined is the maximum area used from November through May. Summer range areas shown are regions of intensive summer use and are not likely the maximum summer range. size. Three- and four-year-old rams could also be aged fairly accurately by horn size, however no attempt was made to determine age of rams older than four years. To obtain daily activity data I sat atop a ridge overlooking a large grassy basin frequented by sheep on the South Slope winter range. Numbers of sheep visible, active (standing, walking, grazing) and not active (lying), were recorded every fifteen minutes from dawn until dark. The figures were then averaged over one hour periods. Sheep were observed from distances of 350 to 1000 yards and appeared to be unaware of my presence. A limitation of the present study is that I was usually not able to identify individual sheep. Migration The pronounced relief of the area reduces the necessity of long seasonal migration for the herd. All sheep in the area appear to occupy separate sum- mer and winter ranges, but in some cases there is no distinct division betw^een the two. In general, the annual distribution of the herd shifts from summer range in the alpine and subalpine zones at roughly 6,000 to 8,500 feet elevation, to winter-spring range on southerly exposed parts of the Ashnola River Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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