Most of these hills are covered in disturbed primary forests and secondary forests, which are especially important for the protection of drainage basins. In the lower reaches, where spiny cedar (Bombacopsis quinatum) is predominant, dry forest occurs. In the intermediate parts there are elms (Ulmus mexicana) and oaks (Quercus). The animal life in these forests includes four-eyed opossum (Phlander opossum), kinkajou (Potos flavus) and porcupine (Coendou mexicanum). Very near to this protection zone is the Iguana Park of the Green Iguana Foundation, where these reptiles breed. The road joining Orotina to the Iguana Park provides access to this protected area.