<p>how about listing them in order of decreasing intelligence?</p>
<p>my rankings:</p>
<p>(lots of dolphin species)
sperm whale, other bony whales, also, northern whales, humpback whale, etc.
orangutan
elephant
bonobo
(lots of whale species, smaller brained dolphins like the river dolphins)
raven
crow
chimpanzee
gorilla
brown bear
wild boar
seals
wolf
other corvids (magpie, etc..)
african gray parrot
(various amazon parrots and macaws, and probably the more primitive parrots in oceania)
lots of other mammals and birds
woodpeckers, harris hawk
herons</p>
<p>(other birds and mammals)</p>
<p>octopus
manta ray</p>
<p>(other mammals, birds)</p>
<p>komodo dragon, monitor lizards</p>
<p>alligators, crocodiles</p>
<p>sharks (especially Mako shark, great white, etc)</p>
<p>lots of other sharks</p>
<p>cichild fish, groupers</p>
<p>most non-lizard non-crocodilian reptiles</p>
<p>other fishes, amphibians</p>
<p>mantis shrimp</p>
<p>lots of arthropods, probably with the social insects at top</p>
<p>then the animals with ganglia and rudimentary nervous systems (flatworms, roundworms, annelids, other worms, water bears)</p>
<p>then brainless animals (with nervous systems): echinoderms, etc..</p>
<p>then the animals without nervous systems.</p>