Dancing David
Penultimate Amazing
we are in no position to test intelligence, much less if we are the only species that thinks.
We don't even have a real definition of thought.
Fortunately, for other organisms, our superior intelligence and sole ability for thought, will soon remove us from the evolutionary history.
Okey dokey, this is science not R&P, um look up number line testing and problems solving.
While I agree that the destruction of habitat and species is a problem, testing for cognitive skills is what it is. I suggest you google the term 'behaviorism'.
As to 'real defintion of thought' , you are out of the ball park and not even in the city.