The latter is a form of processing practised mainly in India in which fermentation occurs on the surface of green coffee beans as they are transported during the monsoon season.
Fungal species (Aspergillus spp. and Rhizopus spp.) were found predominately in monsooned coffees while bacterial species were detected at larger populations
(Ahmad & Magan, 2002).
On the other hand, digestive bioprocessing involves subjecting green coffee beans to a combination of acidic, enzymatic and fermentation treatment as they transverse through the digestive tract of the animal, resulting in the production of two of the world’s most expensive coffees, civet-cat (Marcone, 2004) and black ivory coffee.