I've read some sci-fi novel long ago where lizards during natural selection became more advanced than humans. Also, as some clue, in that book's world transport was mostly biological - I remember giant fishes used as transport. Can't remember its title.
"West of Eden" by Harry Harrison.
The dinosaur race is known as the Yilanè. The human-like race, the Tanu, had evolved from new world monkeys instead of apes.
The story continues in two sequels, Winter in Eden and Return to Eden.
The Yilanè, having had millions of years of civilization, have a very advanced society primarily based on a mastery of the biological sciences, especially genetic engineering, so much so that almost every tool and artifact they use is a modified lifeform. Their boats were originally squids, their submarines are enhanced ichthyosaurs (here called uruketos), while their guns are modified monitor lizards which eject projectiles using pressurised gas.