Udzungwa is the largest and most biodiverse of a chain of a dozen large forest-swathed mountains that rise majestically from the flat coastal scrub of eastern Tanzania. Known collectively as the Eastern Arc Mountains, this archipelago of isolated massifs has also been dubbed the African Galapagos for its treasure-trove of endemic plants and animals, most familiarly the delicate African violet. Undoubtedly, this great forest has yet to reveal all its treasures: ongoing scientific exploration will surely add to its diverse catalogue of endemics.
Ornithologists are attracted to Udzungwa for an avian wealth embracing more than 400 species, from the lovely and readily-located green-headed oriole to more than a dozen secretive Eastern Arc endemics. Four bird species are peculiar to Udzungwa, including a forest partridge first discovered in 1991 and more closely related to an Asian genus than to any other African fowl.
Of six primate species recorded, the Iringa red colobus and Sanje Crested Mangabey both occur nowhere else in the world – the latter, remarkably, remained undetected by biologists prior to 1979.