ナショナルジオグラフィックのインスタグラム(natgeo) - 12月21日 04時50分

@Fritzphotos on assignment for #NationalGeographic in Colorado. American #bison that have been numbered with back tags walk a fenced area at the #RockyMountainArsenalWildlifeRefuge in Commerce City, #Colorado, located near Denver. The purpose of the refuge is the scientific study of the bison. The back tags aid with the study of bison feces to identify what they are feeding on at the refuge.
The arsenal is where the U.S. Army manufactured chemical weapons in the 1940s. The manufacturing facilities were then leased to #ShellOil Co. for their production of pesticides. Production ceased in 1982 and remediation of the land began. The EPA listed the site on the #Superfund cleanup priority list in1987. Parts of the 27 mile site have since been delisted from Superfund. Introduction of the bison to the site lands began in 2007 by the U.S. Department of Fish and Wildlife. Eventually the refuge will support 200 head of bison. Until then, these bison were culled from the current heard of 87 during the annual roundup, which took place earlier this week. Some of them will be sent to homes at other reserves and those without homes will be euthanized.

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• Fritzphotos