| Summary: | Peary caribou and muskoxen were surveyed on Banks Island north of 73° N. in June 1970 to identify critical spring ranges of these animals. The data gathered also lend themselves to population estimations. Critical spring ranges of both animals north of 73° N. are more or less mutually exclusive. Muskoxen were restricted to the eastern side of the island; caribou were widely dispersed and associated with simpler plant communities. Group and herd structures for both animals are given and indicate high productivity. Conservative population estimates indicate far more animals than previously supposed: 5,300-8,000 caribou and 1,200-1,300 muskoxen.
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