The number of wolves has steadily declined since 2009. In recent winters, few wolves have immigrated to theisland, resulting in higher rates of inbreeding and accompanying higher wolf mortality rates. Climate change hasresulted in a steady reduction in ice cover over the Great Lakes. Currently, the wolf population is down to twoindividuals, making their local extinction likely. Without wolves, the already-large moose population is on track todouble in the next few years. The moose are likely to repeat the pattern from the 1930s, decimating their diet ofnative vegetation. The National Park Service will soon decide whether to introduce 20 to 30 new wolves to theisland.