The modern day Komodo dragon has only been around for 4 millions years or so (…only).  Their descendants, though, were from 40 million years ago or so.

Komodo dragons can run around 12 miles an hour.  They’re built to be able to digest even rotting meat and are often scavengers, as that takes less effort than actually hunting.  They’re also cannibalistic, which sounds messed up until you think of it like the dragon version of Highlander.