Or some other animal species?
Octopi is the plural of octopus in case you didn't know.
Orca and dolphin are both closely related (yes the orca is not a whale), but I want to see which of them people think is more intelligent.
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I think the great apes like (chimps, oragutans and gorillas) are generally thought to be the most intelligent animals after us. This is hardly surprising considering they are our closest relatives. Chimps share 99% of our DNA for example. They can learn sign language, solve complex problems, use tools, have complex societies and have higher level of self awareness and consciousness than most animals.