methanogens

Microorganisms that produce methane as a metabolic byproduct in anoxic conditions. They are classified as archaea, a domain distinct from bacteria, and are found in the stomachs of cows, in swamp mud, and in other environments in which oxygen is not present.

Citation: 
Adapted from "methanogens." Wikipedia. Wikimedia Foundation, n.d. Web. 19 Jan 2016
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