I hate to say this, but those green iguanas can hurt you too, & they get quite large (if they're properly kept so they live long enough). They've got claws & can bite, but bear in mind they can also whip their tail & have been known to cut people's flesh right down to the bone with it. Just saying. The male iguanas have been known to react badly & territorially to adult women also- it's weird but it happens.
I'm not really familiar with crocodile monitors, but from what I've heard (or read) from monitor keepers, most monitors are a challenge anyway- & the bigger they get, the truer that is. One thing many people may not think about is that monitors DIG. I mean, there's just many different ways that animals can be "challenging", lol.