| Summary: | Millions of years of isolation from the African mainland have meant that Madagascar has a great variety of novel plants and animals. In fact of the 200,000 species that occur on the island, 75% occur nowhere else in the world. In the depths of a remote cave system in northern Madagascar; rumors abound about a mysterious population of subterranean crocodiles, which could be a new sub-species of the Nile crocodile. The Ankarana Nature Reserve holds a subterranean secret amongst its limestone cliffs, razor-sharp pinnacles and tropical forests. Under the Ankarana plateau are more than 100 miles of caves, passages and rivers that are believed to be home to the world's only cave-dwelling crocodiles.
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