 Complete the following phrase:  Originally seen as a transition zone between the eastern rainforests and the central highlands, Marojejy is now recognized as having its own unique features, with some of the richest biodiversity on the island. Several studies from the early 1970s through the 1990s surveyed the mountain ecosystems and inventoried the flora and fauna. In 2007, Marojejy was listed as a World Heritage Site as part of the Rainforests of the Atsiana. Due to illegal logging and trafficking of valuable hardwoods, and especially after the 