The park is known for its unique volcanic features, its long scenic drive with numerous overlooks, and the unusually clear views of the night sky available. Haleakala is one of the best places in the United States for amateur astronomy, and binoculars and telescopes are available for rent from many local merchants. Nene (Hawaiian Geese, Branta sandvicensis) can also be seen in their natural habitat in Haleakala Crater. Although nene died out entirely in the park, in 1946 they were re-introduced with the help of the Boy Scouts, who carried young birds into the crater in their backpacks.