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In
the foothills and lowlands of both slopes, Costa Ricas
rainforests harbor thousands of known life forms and
yet thousands more to be discovered. They are among
the last strongholds of biodiversity on earth. Resonating
with the songs of birds at dawn, the rainforest is quiet
in the heart of the day, its stillness punctuated by
the insect-like call of poison-dart frogs, the rasping
of cicadas, or the whistled notes of wrens and antbirds.
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