Forests and Mammals
The dense vibrant forest is made up of guácimo colorado, madroño, cenízaro, bully, cedar, locust (including the endangered surá black locust), cow, and silk cotton trees strung with vines and lianas. Along the shore is a mix of manzanillo, beach almond (an import from the East Indies), copey, and coconut palms trees.  Near the entrance, a small area of mangroves boasts three species,  red, buttonwood, and white.

Red backed squirrel monkeys (mono tití) are a big attraction, surviving only in Corcovado, and Manuel Antonio. The park is actually too small to support a viable population, and  the monkeys travel to surrounding areas aided by  aerial bridges over the road sponsored by local school children. White-faced Capuchin (carablanca), spider (colorado) and mantled howler (congo)  monkeys commonly hang around the entrance station looking for handouts (it is illegal to feed wildlife).  Two- and three-toed sloths (perezosos de dos/tres dedos), raccoons (mapache), white-nosed coatis (pizote), and agoutis (guatusa) are other common mammals.