Corcovado is...
One of the world's most outstanding examples of tropical rainforest in terms of trees size and diversity.
A last remaining large tract of lowland rain forest on the Pacific coast of Central America.
An outpost of South American Species in Central America.
An isolated zone of biological diversification and endemism.
An active interface of rain forest and ocean.
A high local habitat heterogeneity: marine and terrestrial/fresh water.
Home to sustainable populations of large mammals and bird due to large intact roadless areas, lack of navigable rivers, and few resident humans.
A spectacular place to visit. Few neotropical forest regions are as easily accessible to visitors, possess field stations, and also support populations of large mammals living in their natural home ranges.
A merging area between the lowlands and mountains that create unique setting.
(Thoughts taken from Larry Gilbert and Al Gentry)
Species likely to be seen:
  • The four species of monkeys that live in Costa Rica (Howler Monkeys, Spider Monkeys, White faced capuchins , and Squirrel monkeys)
  • Aouguties
  • Coaties
  • Two species of peccaries (White lipped and the collared peccaries)
  • Tapirs
  • Anteaters
  • Brocket Deer
  • Jesus Christ lizards (called like that since they can run on water)
  • Caimans, Crocodiles and Anole lizards
  • Bull sharks
  • Snappers and Snooks
  • Tree frogs and poison dart frogs
  • Toucans and Aracaris
  • Macaws and Parrots
  • Tanagers
  • Hermits and hummingbirds
  • The King Vulture
  • Hawks and Falcons
  • Army ants and Ant birds
  • Leaf cutter ants
  • Butterflies and Dragonflies
  • Mosquitos, tics, chiggers,and horseflies
  • Large fig trees
  • Passion vines
  • Endemic trees like the Caryocar and a species of Ant Acasia tree
  • Monkey Latter vines

And many more!!!!!!
To see some species lists check the following website: http://www.utexas.edu/courses/zoo384l/sirena/species/
To see photo albums, click below.  
Herpetofauna:
Arthropods:

Amphibians of Osa

Osa Snakes

Osa Lizards
Arthropod web page (Starting construction)
Page last updated August 2005.