All of the islands within the island group are classified by the
Haribon Foundation and
BirdLife International as
key biodiversity areas, or sites with outstanding universal value due to their geographic and biological importance. All of the islands within the island group have never been part of any large landmass, and thus have unique flora and fauna, most of which are found nowhere else. Research conducted by the
Department of Environment and Natural Resources has found at least five faunal regions in the area, one of the highest densities of separate faunal regions in the world. The islands are also home to the most critically endangered
snake species in the Philippines, the
Ross' wolf snake (found only on the small island of Dalupiri), and the most critically endangered
bird species in the Philippines, the
Calayan rail (found only on the small island of Calayan). The Babuyan archipelago, along with the nearby Batanes islands, have been designated an
Important Bird Area (IBA) by
BirdLife International because they support significant populations of resident
Taiwan green pigeons,
Ryukyu scops-owls and
short-crested monarchs,
Chinese egrets on passage, and wintering
yellow buntings. The island group is also one of the few congregation sites for endangered
humpback whales in
Southeast Asia. Due to its value to the natural world and Philippine biological diversity, various scientific and conservation groups have been lobbying for its declaration as a national park and its inclusion in the
UNESCO World Heritage List. Humpback whales have re-colonized the area and the Babuyan Group of Islands has become the only wintering ground for the species in the Philippines although historical records from the Babuyan Islands have not been confirmed. ==Demographics==