Flora and fauna
The vegetation of the national park consists primarily of lowland and montane rainforest. The forest is characterised by a high level of biodrsity, including Agathis species, Calophyllum inophyllum, Octomeles sumatrana, Koordersiodendron pinnatum, Pometia pinnata, Intsia bijuga, Canarium mehenbethene gaerta, and Palaquium obtusifolium.
From 51 mammal species found in North Maluku, 28 are found on Halmahera Island, of which seven are endemic to this region, and one, the ornate cuscus (Phalanger ornatus), is endemic to the island.
Of the 243 bird species in North Maluku, 211 have been recorded on Halmahera Island of which 24 are endemic, including Wallace’s standardwing, Halmahera cuckooshrike, sombre kingfisher, white cockatoo, invisible rail, blue-and-white kingfisher, dusky-brown oriole, Moluccan goshawk, dusky scrubfowl, long-billed crow, grey-headed fruit dove, ivory-breasted pitta, and azure dollarbird.
Reptiles and amphibians in the park include the Callulops dubia, Caphixalus montanus, and Hydrosaurus werneri. Other endemic animals on Halmahera include two grasshopper species, three dragonfly species, one butterfly species, and twenty land mollusc species.
Human habitation
The park is home to a semi-nomadic community of people known as the Tobelo Dalam or Forest Tobelo. They share a common language with the coastal village communities of the Tobelo people. Their number is estimated to be around 2,000.