Species which need to consume methane as a gas for their metabolism.
“Blagulon Kappans are an intelligent race of methane-breathing creatures from the planet Blagulon...Blagulon Kappan
“The Thara are a primitive, methane-breathing race native to the swamp planet Golrandonvar. At...Thara
“T'ca are yellow, leathery, and snakelike in appearance. They have multiple eyes (and brains...T'ca