The Osa peninsula is one of Earth's most biodiverse areas, with at least half of all species living in Costa Rica found here.

I stayed at the Drake Bay Wilderness Lodge, from where I visited Corcovado National Park and the mangroves of the Sierpe River.

Corcovado National Park


White-nosed coati (Nasua narica), known as pizote in Costa Rica.
Collared peccary (Dicotyles tajacu)

Brown-throated sloth (Bradypus variegatus)

Geoffroy's spider monkey (Ateles geoffroyi) is the largest of the four species of monkey found in Costa Rica.
Black-crowned Central American squirrel monkey (Saimiri oerstedii oerstedii).

Unidentified bats (Chiroptera) hanging under a leaf.


The common black hawk (Buteogallus anthracinus) is a mainly coastal, resident bird of mangrove swamps, estuaries and adjacent dry open woodland.

Crested guan (Penelope purpurascens).

The dot-winged antwren (Microrhopias quixensis) is a bird of the understory of wet forest, especially at edges and clearings, tall second growth.

The slaty-tailed trogon (Trogon massena) mainly inhabits the midstory to the canopy of tropical evergreen forest and mature secondary forest.


Bees and beehive.

Drake Bay


Panamanian white-faced capuchin (Cebus imitator). These monkeys came in to scavenge for scraps behind the kitchen at Drake Bay.


Bare-throated tiger heron (Tigrisoma mexicanum).
Scarlet macaw (Ara macao).

Black vulture (Coragyps atratus).

Sierpe River

I took a boat trip along the Sierpe River, which flows through large expenses of mangrove swamp.

Mangrove swamp.


Amazon kingfisher (Chloroceryle amazona).
Green kingfisher (Chloroceryle americana)
Mangrove swallow (Tachycineta albilinea)
Boat-billed heron (Cochlearius cochlearius)
Little blue heron (Egretta caerulea)
Yellow-crowned night heron (Nyctanassa violacea)
Bare-throated tiger heron (Tigrisoma mexicanum).
Whimbrel (Numenius phaeopus).
Southern lapwing (Vanellus chilensis).


Brown-throated sloth (Bradypus variegatus).
Bats, order Chiroptera.
Black-crowned Central American squirrel monkey (Saimiri oerstedii oerstedii)


Green iguana (Iguana iguana).
American crocodile (Crocodylus acutus).