The park is the habitat of the endemic
tamaraw (
Bubalus mindorensis), a small, hoofed mammal of the
bovid family unique to the Philippines that first documented in 1888. It is one of the most seriously endangered animals in the world. It was for this reason that the park was established, first as a game refuge and bird sanctuary in 1969 with an initial area of , as a national park on November 11, 1970, then natural park in 2018. In 2002, the tamaraw was classified as critically endangered (Criteria: C1), an upgrade listing from 1996 listing of endangered. The tamaraw population is currently estimated at less than 600 individuals, from an estimated population of 10,000 in early 1990. More than 80% of the current population is presumed to be in only one sub-population in a restricted area "No hunting agreement area" within the Mts. Iglit-Baco Natural Park and adjacent areas encompassing about 2500 hectares. The traditional land-use practices from the residing Indigenous Communities and poaching incidents from lowlanders are currently the main threats to the viability of these subpopulations, limiting their chance to expand and increase their population. The biggest population of tamaraw can be found in a mosaic of predominantly grasslands with patches of secondary forests in the southwestern interior of the park. In April 2018, 523 tamaraws were spotted in the protected area. This is up from 327 spotted in 2012. Despite this population trend and ongoing efforts aimed at conserving and protecting this species, the threats to the tamaraw population within the protected area continue to escalate.
The Tamaraw Conservation Program In 1979, the Tamaraw Gene Pool Farm, an off-site breeding facility was established under the Tamaraw Conservation Program (TCP) in Manoot, Rizal within MIBNP. From the inception of TCP in 1979 to date, several agencies have handled the implementation of the Project, including the Presidential Assistance for the National Minorities (PANANIM, 1979-1983); Office of the Muslim Affairs and Cultural Communities (OMACC, 1984); Ministry of Agriculture and Food (MAF, 1985-1986); Central Office of the Department of Environment and natural Resources in collaboration with the Conservation and Resource Management Foundation, Inc. (DENR & CRMF, 1987-1989); Protected Areas and Wildlife Bureau (PAWB, 1990-1997) with the assistance of the University of the Philippines Foundation, Inc. (UPLBF, 1990-1993 and 1995); and DENR MIMAROPA in 1998. In 1999, the management and supervision of the project was again placed under the PAWB, known today as the Biodiversity Management Bureau (BMB).The latter continues to implement the TCP to date (2024). and the
Buhid Mangyans. In
Philippine mythology, for the Tao Buid of the northwest, the land is protected by their gigantic heroine-matriarch Rawtit, while for the Buhid of the southeast, the land was founded by their ancestors, Manggat and Sayum-ay.|246x246px ==Other flora and fauna==