If evolution is true, then why aren't there more intelligent species other than humans?

If you look at us, our intelligence has been a huge evolutionary benefit, assuming that evolution is true, as it has caused us to be able to populate in a huge amount and live without significant risk of death in our daily life, so surely our intelligence is a really good evolutionary trait. So if intelligence is... show more If you look at us, our intelligence has been a huge evolutionary benefit, assuming that evolution is true, as it has caused us to be able to populate in a huge amount and live without significant risk of death in our daily life, so surely our intelligence is a really good evolutionary trait. So if intelligence is so good from an evolutionary standpoint, then why hasn't any single other species evolved to have a level of intellect that is even close to ours?
71 answers 71