Parque Nacional Corcovado, or Corcovado National Park, is the highlight of Costa Rica’s National Park’s system and an area with some of the world’s highest biodiversity. The 41,788 hectares park, on the Osa peninsula near the border with Panama. Only Tortuguero and Monteverde can compare to Corcovado in terms of diversity in Costa Rica.

Corcovado National Park: Thepark’s biodiversity is unparallel and was named recently by National Geographic to be the 2nd most biodiverse place in the world. You will find mangrove swamp, jolillo palm groves, montane forest, and coastal beaches. There are more than 400 species of birds (20 endemic), 116 species of amphibians and reptiles, and 139 mammals. The best time to visit is during the dry season of January-April. Gold was found in the streams within the park decades ago and camps of panners, both legal and illegal, can be found in remote corners. It’s best to stay away if you come in to contact with any of them.
Wildlife:

Scarlet macaws - Seen nearly everywhere in the park and their loud squawks can be heard from miles around.

Jaguars and other Big Cats - It is very rare to see a Jaguar, but the possibility does exist. Many say that the area around Sirena is your best chance.

Monkeys - In Corcovado you can see all four types of monkeys found in Costa Rica: Howler, Spider, Squirrel, and White-Face.

Reptiles: snakes are quite common in the park, as are crocodiles, particularly around Corcovado lagoon. You can occasional see sea turtles including the leatherback nesting on Corcovado’s beaches.

Amphibians: Tree frogs, glass frogs, and poison arrow frogs can all be found.

Sharks - Being a coastal park, sharks can sometimes be seen off shore and are even found in the rivers that head inland.

Coati - Sometimes called coatimundi, these raccoon like creatures can be found in large groups all over the park, often digging for crabs near the shore.

Peccaries - These wild forest pigs can be

Tapirs - These nocturnal creatures are best seen digging through your camp ground at night, attracted by the smells of your food..