> Some are incredibly stupid.

That's from an anthropomorphized angle though? In their evolutionary niche, their level of expressed intelligence seems to be spot on, otherwise they'd have evolved or been outcompeted long ago.

In fact, some of those species that you might consider "incredibly stupid" may have existed long before humans and might easily outlive us if we follow some not-very-unlikely paths that we have opened up with technology and (lack of) social maturity. Who is "incredibly stupid" then?