Every glacier in Glacier National Park is receding. The park had over 100 glaciers when it was established in 1910. By 1966, 35 named glaciers remained. In 2015, only 26 met the size criteria to be designated active glaciers. Snow avalanches, ice flow dynamics, and variations in ice thickness cause some glaciers to shrink faster than others, but all the glaciers have receded since 1966. This retreat, apparent at Glacier National Park, is also seen around the world.