Is it possible for creatures with intelligence more advanced than humans to evolve naturally in the universe?

Human intelligence is limited by how the brain works, and how big the head on a baby can be.

Aliens may have more efficient brains than humans, like birds, or even more efficient than any animal on Earth.

Right here on Earth, birds have at least twice as dense brains as humans. That means that they cram at least twice the computing capacity in the same space as primates. If we had bird brains we might have been much more intelligent.

Was Daenerys' downfall inevitable after she left Meereen in Game of Thrones?

Then we can wonder about the evolutionary selection pressure for intelligence.

And since the universe is so enormously big, it would be strange if we were the most intelligent creatures. Though, we will probably never find out.

Sexual selection. Intelligence is sexy. If you could tell a better story, make a better plan, make a better tool or weapon, you would be popular and get laid.

Can you fly an American flag in the UK in your own private property there? What is the UK’s government stance on that? And if yes, do you also have to fly the UK flag or the American flag can fly solo?

Social groups, and theory of mind. You needed to keep tabs on everyone in the group and understand their drives. Being able to negotiate. It takes intelligence to succeed with this.

They may also not have the same limitations for the size of a birth canal. If they are similar to marsupials, the baby would be born very small and then develop in the pouch, without head restrictions of the birth canal.

Possibly, for us, it was a combination of different things after it reached a certain level:

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So let's say that the aliens have fewer restrictions on brain size, and have more efficient brain wetware, and are subject to sexual selection for intelligence, then they will likely be much more intelligent than us.