The national park's vegetation varies with soil type, altitude and topography. It includes upper mixed dipterocarp forest, oak-laurel forest, heath forest (kerangas), mossy elfin forest rich in Rhododendron species. The boundaries of these vegetation types are not distinct but there is certain degree of overlapping between them. There are many species of orchids and Nepenthes pitcher plants. During an expedition in 1998, a total of 67 species of birds from 29 families, of which 13 species (19.4%) are endemic to Borneo was recorded. Examples were Mountain Imperial Pigeons, Chestnut Crested Yuhina, and Blacknest Swifelet. Meanwhile, bird species found at the peaks of Mount Murud and Batu Lawi were Ochraceous Bulbul, and Mountain Blackeye. Besides, 28 species of mammals, 12 of which are endemic to Borneo was also recorded. Examples were: Mountain Giant Rat (Sundamys infraluteus), Summit Rat (Rattus baluensis), and Civet. In addition to that, 18 species of frogs and four species of snakes discovered. Examples were: Wagler's Pit Viper (Trimeresurus wagleri), and Golden legged bush frog (Philautus aurantium). Insects such as Trilobite bettles (Platerodrilus), fruit flies (Drosophila), and weevils can also be found in this region.