Plant communities in the protected area include montane moist evergreen forest, moist semideciduous rainforest, dry deciduous forest, riparian forest, rupicolous vegetation, littoral forest, swamp forest, humid grassland, marsh, lake, mangrove, secondary grassland, secondary thicket, and secondary forest.[1]
8 species of lemurs, 5 species of carnivorous mammals (including the Malagasy civet (Fossa fossana) and the fossa (Cryptoprocta ferox)) 10 species of bats, 152 species of birds, 27 species of amphibians, and 71 species of reptiles live in the reserve.[1] The golden-crowned sifaka or Tattersall's sifaka (Propithecus tattersalli) and the largest scorpion of Madagascar Heteroscorpion magnus were described from specimens collected in this reserve.[4]