COMMERCE CITY — Three years after a former weapons and pesticides plant reopened as the nation’s largest urban wildlife preserve, bison are multiplying too fast.
There are 85 today, more than quadruple 2007’s number, threatening to degrade drought-prone prairie at the Rocky Mountain Arsenal National Wildlife Refuge. Federal biologists say they must cut the herd by 25 — and keep it at 60 until fenced habitat is expanded.