Faunal characteristics and adaptations of benthic foraminifera associated with cold seepages are discussed. A few species are known from cold seepages where an anoxic environment was produced due to methane or hydrogen sulfide gas. There are two possible explanations for the survival of benthic foraminifera in anoxic/euxinic cold seepage environments. First, some foraminifera may be able to tolerate anoxic environments, using anaerobic respiration system. However, in this case, the foraminiferal tests should dissolve due to organic acids produced during anaerobic respiration. Second, foraminifera may be in symbiosis with sulfide oxidizing bacteria. The author believes the second explanation is more likely to be true, and the possibility of sulfide oxidizing bacterial symbionts in cold seepage foraminifera is explored.