Humans do regenerate; in fact a lot more than the unexpected.
And it’s not just the lizards or plants who do. we do it too. we know the process of regeneration as “Sleep”.
Assuming If one didn’t know what sleep was, and one had only seen it in a science fiction movie, one would think it was weird and tell all friends about the movie seen.
“They had these people, you know? And they would walk around all day and be okay? And then, once a day, usually after dark, they would lie down on these special platforms and become unconscious. They would stop functioning almost completely, except deep in their minds they would have adventures and experiences that were completely impossible in real life.”
So, next time you see someone sleeping, make-believe you’re in a science fiction movie. And whisper, “The creature is regenerating itself”.