Obviously, humans are not that species.
We're looking instead for a species with that doesn't have joint and teeth problems, the organs aren't hanging sideways, the kidneys aren't on the outside of the bodyshell, the eyes aren't inside-out and sideways, color sensing is full-spectrum, and the sex organs are not mixed up with the organs of elimination.
One that is friendly, gentle unless radically provoked, curious, and isn't prone to busybody intruding into it's neighbor's business.
That would be... the octopus.
Ai! Ai! Ai!