
Corcovado currently is the only entry on the Tentative List of Costa Rica. There seem to be no plans to bring it forward (again), after the 2004 withdrawal caused by a negative IUCN advice. At the time it was dismissed with not much further explanation than “too small”, too small even for its mammals to survive in the near future. It could not match similar sites (Darien, Talamanca) that were already inscribed. Although I can see the point, I still found it the most worthwhile destination of my Costa Rica trip.
I based myself for 3 nights in Drake Bay, the most common access point on the Osa Peninsula. It is off the beaten tourist track, but not that remote. The area around Drake Bay itself is already really nice, I did a late afternoon birding tour there and hiked part of the Drake Bay Trail (a 20km long coastal path) on my own. I could have easily stayed one or two nights longer, tying in a trip to Isla del Cano for example.
For my Corcovado visit I booked a day tour to the Sirena station of the National Park at the cost of 85 USD. You may only visit the park accompanied by an official guide. At 6 a.m. two boats with some 25 tourists each set from the coast of Drake Bay, already a minor adventure in itself as the place has no jetty. So you have to wade from and to the boats. I shared a guide with a couple from Alaska and a guy from Spain, so it was a pleasantly small group. We hardly met the other groups while in the park, we only did so at the centrally located ranger station which has a small shop, a place to refill your waterbottle and toilets.
After an hour’s boat ride we landed at low tide at Corcovado. There is a very large tidal difference and we had to walk 200 meters over pebbles and the remains of molten lava to get on shore. We had to report to the ranger post first. What now is the park used to be inhabited and it was agricultural land. It only became a protected area in 1975.
Corcovado is best known for the presence of a large number of mammal species that are easy to spot. In the bushes right next to the beach we quickly discovered a small deer, a Red brocket. We left the beach for the forest at the mouth of a river, an idyllic spot. This is where the guide found us the flagship species of Corcovado: the Bairds tapir. These animals are most active early in the morning, now around 8 o'clock they were resting. We found two: a mother with a 6 months old calf. They were in the undergrowth and we tried to find an angle to take good pictures without disturbing them.
That effort proved to be unnecessary in the end, as after a few minutes they started walking out into the open on their own. They ate some leaves, peed in the river and then disappeared from sight. Although we were only 5 meters away, they went about their business undisturbed. While we were waiting for the tapirs to move, one of the tour mates suddenly spotted another creature walking over a tree trunk. I immediately recognized it as a tayra, a marten-like species. The guide was also completely perplexed that we saw it in broad daylight. These were certainly the 15 best mammalwatching minutes of this trip!
We spent 4.5 hours in Corcovado and walked a couple of the trails around Sirena. Monkeys are easily seen here, but I had already covered all four Costa Rican species without much effort in the days before. Only the Geoffroy's spider monkey can be observed here better than elsewhere. We found a group relaxing on the tree branches. Furthermore we saw three more tapirs resting in a mud bath, an agouti, mantled howler monkeys, Central American squirrel monkeys and some birds including a spectacular woodpecker. And a group of white-nosed coatis ran down the path. Our efforts to spot a sloth were unsuccesful. We did see a boa constrictor though, sleeping in a tree. It did not show its head, but its fat body alone already was impressive.
So mammalwise it was a succesful tour. It may be because of the park’s relatively small size and island-like biological isolation that the animals can’t move away from the park trails and are accustomed to the presence of people.
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