An article about some species of octopuses that have a relatively high IQ, but since the parents die before their offspring comes to life, every generation have to relearn everything from scratch. IIRC, the lack of inter-generational communication deprived this species from developing to the level its IQ permits. I wish I can find that piece again!
It does not matter how smart you are if you can't learn from parent and have only few years to gain life experience.