User blog comment:Matt Hadick/Ultimate Kaiju Battle Round 3/@comment-76.8.177.233-20130619224408/@comment-205.144.218.234-20130620171738

King Ghidorah may be a weak-minded creature (evidenced by the sheer number of aliens that have controlled it in the past), but it's still one of the most powerful daikaiju in history. Ghidorah has only died on three occassions: the Futurian invasion of 1991 (Godzilla vs. King Ghidorah, and that was a genetically weak clone fighting against a powered-up Godzilla who now stood at twice his original height); the Kilaak invasion of 1999 (Destroy All Monsters, and he was ultimately killed by the combined might of eight monsters); and the incident in 2001 where Godzilla was possessed by the spirits of those killed by the Imperial Japanese Army in WW2 (Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack, and this Ghidorah was also significantly weaker than before, likely because it was underdeveloped).

And besides, Ghidorah's smallest size was in that last movie I mentioned, at 49 meters. That's still nearly 150 feet tall.