I think a successful high level intelligence should quickly accelerate or converge to infinity/physical resource exhaustion because they can now work on improving themselves.
So if above human intelligence does happen, I'd assume we'd know it, quite soon.
Process vision and sounds in parallel for 80+ years, rapidly adapt to changing environments and scenarios, correlate seemingly irrelevant details that happened a week ago or years ago, be able to selectively ignore instructions and know when to disagree