The Pine Bush is the only sizable inland pine barrens
sand dunes in the United States, and is recognized worldwide
as a unique pine barrens ecosystem. It contains over 300 species
of vertebrate animals, over 1,500 species of plants, and over
10,000 species of insects and other invertebrate animals. Many
of them are rare and restricted to the Pine Bush habitat. Its
most famous occupant, the Karner Blue Butterfly, is on the Federal
and State's endangered species list.