In this September 2013 aerial file photo provided by the Massachusetts Department of Conservation and Recreation, a dirt and stone road leads to Mount Zion Island, at rear, at the Quabbin Reservoir in Petersham, Mass. A plan by the state to start a colony of venomous timber rattlesnakes on the off-limits island in the state&amp;#x2019;s largest drinking water supply came under fire, and became one of New England&amp;#x2019;s odd stories in 2016. Photo: Mass. Dept. Of Conservation And Recreation Via AP

 / Massachusetts Department of Conservation and Recreation