Kaiju

Kaiju (怪獣, Kaijū, lit. Strange Beast), which roughly translates as Monster, is the classification given to any non-intelligent beast found throughout the works of Tsuburaya Productions. Kaiju are generally organic and do not cover robots. They can be both terrestrial or extra-terrestrial, but are not labeled as aliens (Seijin) unless they show major intelligence like that of a human.