Whether or not a Biblical word translated as a kind of serpent refers to something which may have been a dinosaur is context dependent. Sometimes a snake is just a snake. Sometimes a serpent is a Sauropod.
Dinosaur Classification
First Mammals; Rise of the Dinosaurs
First mammals? A place where mammals were buried doesn't make them the first mammals. The presence of mammal remains in sediment is used to place the sediment in timeline of the evolution narrative.
August 18th
We (that's me and the Holy spirit) believe that dinosaurs and humans were on the Earth at the same time. In the creation narrative humans were fully formed Homo sapiens while Tyrannosaurus rex walked the Earth.
June 1st
For many years dinosaurs have been classified into two main types based on their hip structure: Ornithischia and Saurischia. Hip structure relates specifically to the different origins of Hydrosphere and Atmosphere.