 The river basin is home to 273 plant species and 67 species of wild animals, as well as 8 species of fireflies, including "Pteroptyx macdermotti" which is very rare and endemic to the Philippines.The mangrove species "Camptostemon philippinense" (locally known as Gapas-gapas) is globally endangered and the rarest mangrove species in the Philippines.The Abatan River estuary is home to the following true mangrove species (with local names in parentheses)