I would think any extinction, local or otherwise, occurs with more than one predator and more than one contributing factor other than predators, such as weather, pathogens, etc.The balance of nature is a widely held, now discredited, theory. <a href="http://en.wikipedia.org/wiki/Balance_of_nature">http://en.wikipedia.org/wiki/Balance_of_nature</a> Now whenever I read the word ???balance??? alarm bells start ringing in my head, because usually a reference to tha