Megaradon tai Teratornis

Whoa. Have you ever noticed that any prehistoric species with a name derived from -odon ("tooth") sounds like an awesome kaiju? Eg Hyaenodon, Daeodon, Megalodon, Liopleurodon, Machairodus.

"Masaru Satō - Showdown Between the Three Large Monsters on Okinawa 3 (GODZILLA VS. MECHAGODZILLA)" (Watch on YouTube)