2 The elimination of wolves Canis lupus from Yellowstone National Park in 1926 and their reintroduction in 1995 provided the

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2 The elimination of wolves Canis lupus from Yellowstone National Park in 1926 and their reintroduction in 1995 provided the opportunity to examine ecological interactions with elk Cervus elaphus The National Park Service made efforts between the 1920s and 1968 to reduce the size of elk herds by culling selective killing because of concerns about overgrazing The graphs provide the trends for the numbers of wolves and elk in Yellowstone National Park from 1900 to 2004 High Number of wolves Number of elk Low 1900 High Low 1900 Wolves eliminated 1926 1920 1940 1920 1940 CONT 20 1960 End of elk culling 1968 1960 Wolves reintroduced 1995 1980 1980 2000 2000 Year a Outline the changes in elk population between the years 1930 and 2004 3

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