The guts of cow and buffalo possess:

The Bovine rumen is a niche that has a narrow pH range and is kept fairly stabilized, so that the bacteria in the rumen as well as the intake sacs for food and water are not too disturbed. The organisms responsible for producing methane through bovine rumen are termed methanogens and do so in order to reduce the amount of carbon in the rumen system for fermentation. There are two major divisions within the methanogens found in the bovine rumen. The Methanobrevibacter ruminatium and the Methanosphaera stadtmanae.