Archaic Western Dragon

Summary
Archaic Western Dragons are a near-extinct variety containing only one remaining member– Argo. They are the largest creatures ever to roam the planet- even larger than Blue Whales. Their enormous size led to their downfall– they were so big they could not feed themselves, and so they all starved to death, Except Argo since he is immortal. They also apparently had a knack for keeping a well-toned body, and were, quite probably, the most muscular creatures on Earth. The average member was about 180 feet tall.