HELENA, Mont. (AP) — Federal wildlife officials say two species of rare, winged insects in the Rocky Mountains will need several thousand acres of glaciers and snowfields if they are to survive a warming world that’s threatening them with extinction. The western glacier stonefly and the meltwater lednian stonefly live in streams that flow from melting glaciers and snowfields. Scientists say the insects are not doing well. They face continued declines as they lose a projected 80% of their habitat in Glacier National Park by 2030. The stoneflies’ peril underscores the threat climate change poses worldwide to mountaintops that are considered “biodiversity hotspots.”