The mountains of the Massif de la Hotte are mainly karstic and volcanic. The park features endangered plant and animal life, including some endemic to the island of Hispaniola. There are 220 species of birds present in the park, 141 species of orchids, and 367 flowering plants. Six species of frogs, believed to be extinct, have been seen the region in the past several years. Over 6,500 species of plants live at Pic Macaya.