Many of them ran up to tree tops and wouldn't come down.

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The experience itself is captivating: almost without warning, a chimp brushes past you on the trail, several individuals become visible in a clearing just ahead or high above in the tree tops.

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"This was especially fun because you get to experience the countryside and villages of Costa Rica by riding through them on an ATV, and then you cool off by zip lining through the tree tops in the jungle, " Berte said.

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Ahead of them a horse whinnied in the timber and then, through the brown trunks of the pine trees, only a little sunlight coming down through their thick, almost-touching tops, he saw the corral made by roping around the tree trunks.

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