So also outside of mammals and birds there are some cases of brain evolution towards greater complexity, even if not reaching the typical mammal/bird level, and which are likely to also correspond to a somewhat different brain structure.
(Off topic, in my opinion, "reptiles", is a term that is properly applied only to lizards and snakes. Not only crocodiles and turtles are more closely related to birds than to lizards and snakes, but also none of them are crawling, as implied by the word "reptile". Actually the present crocodiles are awkward on land only because they are secondarily adapted to an aquatic life. Their terrestrial ancestors were much more agile, as still demonstrated by some crocodiles that are even now able to gallop.)
Most fish (bony fish) are more closely related to us than they are to sharks and other cartilaginous fish. Technically we're all air breathing walking bony fish.
It's an utter bombshell if true. It means intelligence isn't "difficult" for evolution to arrive at, significantly increasing the odds of other intelligent life in the universe.