Not really negotiation but a threat. I've on more than one occasion said to a wasp that has got to near my drink "F*** off wasp, or die" but they have taken no heed of the warning.

Best one I read was one on cockchafers. I found this on wikipedia:

"In the Middle ages, pest control was rare and people had no effective means to protect their harvest. This gave rise to events that seem completely ludicrous from a modern perspective. In 1320, for instance, cockchafers were brought to court in Avignon and sentenced to withdraw within three days onto a specially designated area, otherwise they'd be outlawed. Of course, the cockchafers didn't obey, and were collected and killed."

As for your's Bobert. sounds a good approach to me.