Bulbasaur (Dinosaur), Chikorita (Dinosaur), Treecko (Geeko-Dinosaur evolution), Turtwig (Turtle-Dinosaur evolution)
Verdict: Grass starters are dinosaurs.
5th gen Grass: Stymoss-
Dinosaur counterpart
Charmander (Salamander/Dinosaur), Cyndaquil (Echidna-Wolverine in evolution), Torchic (Chicken hatchling/chicken), Chimchar (Ape)
Verdict: Not repetative, may be something unknown. Possibly a bear?
5th Gen Fire: Cynderpaw? though this could work for many species of animals.
Squirtle (Turtle), Totodile (Crocodile), Mudkip (mudpuppy/salamander), Piplup (Penguin)
Verdict: All revolve around water, and so far piplup is the only warm blooded species, perhaps another warm blooded, maybe a mammal since seeing the comparison of other element typed starters and the partern.
5th Gen Water: Dripot?
Though ideas are slim choices can be from an otter, shark, or manatee.
Of course starters all have a basic linear set of moves that they learn, besides a few new ones.