Let me elaborate, how likely is that there’s an animal on earth that’s smarter than us? By smarter, I understand intelligence is a nuanced topic unique to different animals, so for the sake of argument, let’s talk about, mathematics, critical thinking about where and how to apply those mathematical concepts, and creativity in any form.
I’d say there’s around 50% that either multiple large dolphin species, or more likely, just one dolphin species, being truly smarter than us and that’s the Orca. Orca’s are the only known species known to have more cerebrum neurons than human beings. They just don’t have any fingers, let alone opposable thumbs, and live in the ocean.
There is a possibility however that Orca’s are still less smart than the average human for they could be using much of their brains to manage sleep as they can’t fall asleep like humans do or they’d drown.
If we were be able to communicate with them, I would imagine them arguing for humans to turn their society into a more permanent matriarchy instead of the current human feminist ideal, through genetic engineering, specifically making human females a little bit taller, while arguing that the human males are fine in length, but should prefer giant women like a Greg Universe. And for the average desired human female length, seven or eight meters tall should be enough.
Also, chimps are smarter than humans in one key area, which is short-term-memory.
They can easily beat you in a game of memory without fail.