Ever read Harry Harrison's Eden Trilogy?
Where the dinosaurs do not go extinct and have evolved into a society
where their technology is mainly biological.
Humans are around, but mainly as Stone Age hunters in what we would
call the Americas. When some dinosaurs start colonizing the New World,
it is trouble for the walking, talking mammals.
http://prehistoricpulp.blogspot.com/2007/08/west-of-eden-by-harry-harrison-1984.html
