The park is home to many endangered species, including:
Sumatran Elephant (about 500 animals, or 25% of the total remaining population of this subspecies live in the park)
Sumatran Striped Rabbit (all recent records of this poorly known species have been from the park)
Sumatran Rhino (an estimated 60-80 Sumatran rhinos live in the park; approximately the same number live in Gunung Leuser National Park, and when combined the two parks account for the majority of this species' population)
Sumatran Tiger (approximately 40 adult tigers or 10% of the remaining Sumatran tigers live in the park).