If you had the ability to talk to one species of animal, which animal would you choose to communicate with? Why?

If given the ability to communicate with any animal, I'd choose any one which has gone extinct due to our society. I'd want to talk to them in order to understand their thoughts, and emotions towards their limiting number of species in hopes that perhaps the truth of the matter would persuade our civilization to slow down, and realize the effects that their actions are having on each and every species.