The National Audubon Important Bird Area program is part of a global effort to identify critical sites for birds all over the planet. Located in northwestern Vermont, the Missisquoi Wildlife Refuge is home to hundreds of bird species and is one of the largest wetland ecosystems on Lake Champlain. The refuge is considered an Important Bird Area because of the number of endangered, threatened and priority bird species that can be found on the refuge. Two bird species that depend on the refuge are osprey and great blue herons as seen in this next segment produced by Audubon Vermont and Peregrine Productions.