smilodon

No, but it's now on my "more fun with added G" list. :)

And here I thought this was on your "fake dinosaurs" list.

This creature was a large, happy-go-lucky animal that frequently encouraged its fellow creatures to skip joyfully through their environs, whether those environs were a primeval forest, a swamp, or some other godforsaken petrochemical-laden or volcanic area.

Just kidding. It was actually a fairly vicious-looking saber-toothed cat with a freakishly misleading name. "Among the largest felids, the heaviest specimens of this massively built carnivore may have reached a body mass of up to 400 kg/880 pounds." I wonder if even this fascinating animal could be made more interesting with the addition of a G...

Interestingly—probably a bunch of wordies already knew this, but I didn't—the name comes from the Greek word "smilē," which means "chisel." (So saith Wikipedia, anyhow.)