Titanis, largest of the terror birds. This bird grew up to roughly 7-8 feet tall and could run faster than a race horse, scary right?

Take a Kamoto Dragon make it 3ft tall and 16ft long and you get Megalania a ancient predator of Australia that could kill pretty much anything that got in it's way

Titanaboa a 30-40ft long snake that fed on 15ft blunt nosed crocodiles.

And that's it

For now!