Need help with making up an extraterrestrial?

Well, a creature that isn't "intelligent" is anything besides a human... and a non intelligent creature would die off from intelligent creature. Think of how us humans steal "unintelligent" creatures lands in the rainforest and they die. That is how. That is a good example if an advanced alien race ever found us, they would steal our planet and resources and kill us all. Start your alien off similar to the intelligent one, but without the "intelligent" traits. BTW: a intelligent creature is intelligent if it can create tools to achieve a purpose. FYI: monkey can unpeel banana...