Rio Frío are biological humid areas considered to be one of the richest in biological diversity in Costa Rica. Here you can find a great variety of resident and migratory birds plus three different species of monkeys, also iguanas, sloths, turtles and caymans. The tour starts at 7: 30 a.m. when we pick up all "Nature Lovers" from the hotel in a very comfortable bus for the 1-½ hour Transfer to Los Chiles, a culturally mixed village only 4-km from the Nicaraguan border. Here your boat waits for your river adventure, at that time we begin our 4-hour floating safari through Tropical Rain Forest and pastures until we arrive at the marsh. An experienced English - Spanish speaking guide leads the tour.

Some birds are residents in the area and it is possible to see hundreds of them especially during the dry season. Some of them are Anhinga or Snake - bird, Roseate Spoonbill, it is possible to see little groups of this bird eating in the surroundings of the river. Wood Storks, the Jabiru, the largest bird in Central America and very endangered. Also the Olivaceous Cormorant, that makes its nest in the area, it is also the most popular bird in the refuge. Caño Negro has the largest colony of cormorants in Costa Rica.

Along the river we can see howler monkeys, spider monkeys, white-faced monkeys, also the three-toed sloth and some reptiles like caimans, Jesus Christ lizard and turtles.

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