The oyamel fir forests of Mexico's Central Highlands play host to one of nature's most awe-inspiring spectacles: the annual migration of millions of brilliant orange-and-black monarch butterflies. Journey with Expedition Leader Charlie Reinertsen to explore the wintering grounds of this beloved -- but endangered -- butterfly. Learn about the ecological significance of the monarch migration, find out about conservation efforts to ensure this wonder persists, and discover how you can experience it for yourself on our Kingdom of the Monarchs trip.