A bus (which Gok already mentioned), more than anything else.

A Taxi (again mentioned by Gok).

A lizard without some misplaced frill.

Any marsupial. BW Snarl does not count - he's sort of like a dunnart, but is not an actual marsupial.

A realistic submarine that's not a Minicon. We've never had one!

A Battleship.

A fork lift.

(BTW Gobots gave us these last three!)

Less generic sports cars would be nice...