While typically both mammals and birds are significantly more intelligent than the other vertebrates, it must be not forgotten that there exists an overlap in i

While typically both mammals and birds are significantly more intelligent than the other vertebrates, it must be not forgotten that there exists an overlap in intelligence between the smartest reptiles, e.g. varans a.k.a. monitor lizards, and the dumber mammals and birds. 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.)