スミソニアン国立動物園のインスタグラム(smithsonianzoo) - 7月11日 22時03分

"Nature finds a way to harmonize everything in existence, even bison rolling in the dirt. Bison wallow to deter flies. The disturbance in the soil creates craters that retain water, that in turn promotes the growth of grassland plants that need moisture, that are used as resources by other species. One action leads to another, a flow of energy that starts with a bison wallow." Hila Shamon, ecologist, Smithsonian Conservation Biology Institute
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