Some bacteria can grow anaerobically on cellulosic material producing large amount of methane gas along with carbon dioxide and hydrogen. They are called methanogens.
The animals they are present in are the cattle specifically the rumen of cattle (a part of stomach) where a lot of cellulosic material of food are present. Methanogens help in breaking down of this cellulose to help in the digestion of the same and this plays an important role in the nutrition of cattle.
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