Rules and regulations:

The Yimu tribe is a despicable gang of evil-doers. These one-eyed monsters are probably despised by many readers. Why not grab this chance to exterminiate them? Just click on the eye of an Yimu member, and then click again on any other part of its body. The Yimu creature will then die.

Be warned: you have to act fast before five of these creatures pop up together and overwhelm you instead.