I'm familiar with Monitor's. A favorite is the Komodo Dragon. The world's contemporary version of Dinosaur, in my opinion.
Many years ago there was an old man who was a researcher on Komodo island. He'd been there living among the dragons for many years.
Then after a number of days his base team on the mainland became concerned he'd not radioed in for supplies.
A team was sent to check on things. He was never found.
An amazing lizard really. Their venom starts the process of necrosis immediately after they bite a victim. Then if the victim flee's the dragon will track them for days, as long as it takes, in order to feast on what remains.
Humans tend to have this idea we have dominion over everything that walks, crawls, or flies. Every now and then a reality check is a good thing. Humbling even.