What animals could Humans live without if they went extinct?

[super_etecoon]

curl-6 said:

Cats.

Seriously though, I find the view that the earth is here for us too use as we want at the expense of all other organisms to be supremely arrogant.

This. Especially since we have such a profound understanding of the ecosystem I think more than ever we should consider ourselves stewards of one of the greatest Petri dishes the universe (that we can see of it so far) has ever created. With great power comes great responsibility and all that. That being said, we also need to know when things are just on their own way out.