What is the area of the park where  Maui ‘alauahio could be found? 
33,265 acre
Title: Haleakalā National Park
Passage: Haleakalā National Park is a national park located on the island of Maui in the U.S. state of Hawaiʻ i.  The park covers an area of 33,265 acre , of which 19,270 acre is a wilderness area.
Title: Oʻahu ʻalauahio
Passage: The O'ahu 'alauahio ("Paroreomyza maculata"), also known as the Oahu creeper, is a small finch-like Hawaiian honeycreeper that is endemic to the Hawaiian island of Oahu.
Title: Maui ‘alauahio
Passage: The Maui ʻ alauahio ("Paroreomyza montana newtoni") also known as the Maui Nui ʻ alauahio or Maui creeper, is a species of Hawaiian honeycreeper.  It is endemic to Hawaii.  The name, Maui ʻ alauahio, is somewhat misleading because the species seems to have occurred on most, if not all, parts of the ancient Maui Nui.  Its natural habitats are dry, mesic and wet forests, as well as high and low shrublands and plantations, and can be seen at Polipoli Springs State Park, and Hosmer's Grove at Haleakalā National Park.  It is threatened by habitat loss.  Their call is a loud "cheep", and their song consists of a repeated whistled phrase "whichy-wheesee-whurdy-whew".
Maui ‘alauahio Haleakalā National Park