No creatures are kings, except maybe for E. coli. I still seriously think this is the Age of Bacteria. They are much more successful than we are, and they'll outlast us and octopi. Although it may sound like animism, there is even a lot going on underfoot, with fungi, bacteria and plants. I think we've finally learned enough to know how little we know, and looking more closely is showing us intelligence evolved early, and shows itself in a lot more than we used to think. It may not be intelligence as we define it in ourselves (where it seems less and less of it is there for discovery sometimes).
There are still people who deny fish have nervous systems to process pain, in an era when we're learning about chemical communication in plants, ant societies, other mammals and several birds using tools, the brain and nervous system of an octopus, etc. This is the coolest planet we know, and we are lucky little mammals to be here and be capable of learning about it.
The next time you hug a tree, maybe it will use its microrrhizal network to tell its buddies your armpits smell dangerous.