If given the ability to talk with just one animal specie, which would it be and why?

Do Tarzan and Dr. Doolittle have anything on you? Nah! You have the power to communicate with an entire specie of any animal of your choice. You can be as simple as a friend to all of them or you could be their high-profile world leader, looking after their interest and maybe even make some profit as you advocate their cause and negotiate business in their behalf.

A playful question nothing more. If you could come up with real funny answers that will be great. Thanks!