Fish are smarter than you, just ask any fisherman.
OK, maybe fish can't do calculus. But that's not a fair comparison because you can't really do calculus either.
One kind of fish smarts is hiding. Some fish can morph their coloration to create a camouflage pattern, good enough to vanish in front of your eyes. Watch the amazing flounder in the video below. Then, you can read about the secret tricks of fish for hiding in plain view.
One surpriseg is that fish can do camouflage without their eyes. They can "see" with their skin and pineal gland, so well that they can camouflage themselves without needing their eyes.
And if that's not interesting enough, did you know that you have a pineal gland, sometimes called your third eye and believed by Descartes to be "the seat of the soul." It's one place where your nervous system and endocrine system (hormones) connect. And...
When awakened, the third eye (pineal gland) acts as a 'stargate' thatTweet
sees beyond Space-Time into Time-Space.