> We're not the only intelligent life on earth. We cant even define intelligence or measure it meaningfully.
If we can't define or measure intelligence meaningfully, how can you even claim we are 'intelligent' to begin with?
> Elephants, crows, dolphins, octopi, chimps, orang utan are all clearly very smart
The have levels of intelligence, but they are clearly not very smart. You couldn't even teach them the multiplication table or the basics of number theory.
> and more intelligent than a human child.
No species you listed is smarter than a human child.
> Besides being biologically irrelevant, the separation between humans and animals creates this weird divide where we constantly assume that we are the only intelligent life.
At the very least, we know that mammals with brains have some level of intelligence. Nobody claims humans are the only 'intelligent' life on earth. The claim is we are the most intelligent. And probably the only creatures intelligent enough to ponder about death, mortality, identity and soul.
> Maybe one day we'll understand better what other minds are like and we'll understand better how we are not alone or special.
Or maybe elephants, crows, dolphins, octopi, chimps, orangutans will better understand what other minds are like and they'll better understand how they are not alone or special? After all, they are 'very smart' according to you.