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.
All sorts of animals have superior application-specific circuitry. Like bearded vultures that, while in flight, can drop bones precisely onto rocks to break them open and get at the marrow. But they lack the general-purpose processing power needed to abstract such skills into mathematical representations. Same abstraction likely needed to apply one skill creatively to other uses or apply logic to analyze something.
I’m no neuroscientist/biologist, but I could see an ideal scenario and measurement setup where dolphins and orcas maybe rival our general-purpose intelligence. But whatever it is, it still isn’t enough for them to build any recognizable society yet.