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In page Margaret Murie:

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From 1927 onward, the Muries were residents of Jackson, Wyoming, where Olaus studied ecology, specifically the elk population. Mardy worked side-by-side with Olaus in the field, studying elk, sheep and numerous other animals in the Greater Yellowstone Ecosystem. The couple would camp for weeks at a time in the wild, open valley of Jackson Hole. Olaus' primary goal was to identify pressures on the elk population, causing the startling decrease in the area. Over the course of nearly 40 years, The couple had numerous backcountry expeditions tracking the wildlife in the area. The couple even took expeditions when their three children were still nursing.[citation needed]