Has anyone mentioned dragons yet ?
Some of the beasts that existed on Earth BETWEEN the more famous epochs (Cretaceous, Ice Age) but usually only noticed on a mass extinction can throw out quite a few, and more than these ..
DRAGON .. not quite a dinosaur but still a "terrible lizard"!
The aptly named Terror Bird .. just killed a donkey!
ANTS! .. they're not called "creepy" crawlies for nothing.
And they're not all killers .. Icotherium (are related to Rhinos)
This doesn't even get into theoretical creatures based on Silicon, or (on cold cold cold planets) with a Nitrogen DNA structure??
Love it.