Rinjani National Park lies within the major transition zone(Wallaceae) where the flora and fauna of South East Asia makes a dramatic transition into that which is typical of Australasia. The Park has a rich variety of plants and animals, although they can be hard to spot due to the terrain and rainforest cover.
Sometimes seen early in the mornings is the rare black Ebony leaf monkey, known locally as Lutung.

TheLong tailed grey macaque or Kera is common in Lombok and older males are seen on the crater rim. Rusa deer are forest dwellers and are occasionally seen along the Rinjani trek trail. The smaller Barking deer or Kijang has an alarm call with a distinct dog-like bark. Look for the disturbed ground where the Wild pig or Babi hutan has been foraging. Also found in the forest is the Leopard cat or Bodok alas, Palm civet or Ujat and Porcupine or Landak.

A variety of colourful birds live in the forests of the Park. Perhaps the best-known icon of the Park is the Sulphur Crested Cockatoo that is not found any further west of Lombok. Many of the forest-dwelling animals, insects, birds, civets and monkeys owe their survival to the wild fig tree or Beringin as a provider of food and shelter. The pine-like Casuarina species, Cemara, are a feature of the grassy higher slopes. Orchids or Anggrek are also a feature of the grassland areas, as is Edelweiss or Bunga Abadi growing above the tree line; it is a beautiful icon of the Park and one of our best-known sub-alpine plants.