Ammonite / Mantled howler monkey (Alouatta palliata) climbing through canopy, showing use of prehensile tail, Santa Rosa National Park, Costa Rica.

Ammonite / Family of White-throated / White-faced capuchins (Cebus capucinus) resting and grooming each other, Santa Rosa National Park, Costa Rica.

Ingo Arndt / Black-handed Spider Monkey (Ateles geoffroyi) hanging by its prehensil tail in forest canopy, Santa Rosa National Park, Costa Rica

Doug Wechsler / Biologist releases Olive Ridley turtle hatchlings from study nest, Santa Rosa NP Costa Rica

Martin Dohrn / Army ant bivouac made entirely from body mass of migrating ants {Eciton burchelli} Santa Rosa NP, Guanacaste, Costa Rica, Central America

Greg Basco/ BIA / Thunderstorm along coast, Santa Rosa National Park, Costa Rica

Ingo Arndt / Tree roots and rock in dry Forest during rainy season, Santa Rosa National Park, Guanacaste, Costa Rica.

Ingo Arndt / Aerial view of Naranjo beach, Santa Rosa National Park, Costa Rica

Huw Cordey / Female Olive Ridley turtle (Lepidochelys olivacea) returning to the sea after nesting, Nancite Beach, Santa Rosa National Park, Costa Rica.

Huw Cordey / Black iguana (Ctenosaura similis) predating hatchling olive ridley turtle (Lepidochelys olivacea), Nancite, Santa Rosa National Park, Costa Rica.

Huw Cordey / Tracks of hatchling Olive ridley turtles (Lepidochelys olivacea), Nancite Beach, Santa Rosa National Park, Costa Rica.

Huw Cordey / American crocodile (Crocodylus acutus) hunting hatchling Olive Ridley turtles. in the shallows of Nancite Beach, Santa Rosa National Park, Costa Rica.