Sal forests cover 70% of the area and there are about 600 species of plants and are home to the only significant number of one-horned rhinos and other endangered species like the Bengal Tiger, the Gangetic Dolphins and the Gharial Crocodile. There are altogether over 43 species of large mammals, 526 species of birds, 150 different types of butterflies, 126 species of fish and 49 species of reptiles.