In Costa Rica there are 4 species of monkeys.

These are:

Congo or howler monkey
Mono Cariblanco
Mono Titi
Mono Araña

The two species that are even see over the Congo and Mono Cariblanco. Congo lives in the entire region of Guanacaste, by highlighting its howl noise.
The Mono Titi can be seen quite easily in the Central Pacific, in areas such as Paradise Carlisa or Manuel Antonio National Park.
 

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