So these guys (or girls?) were born in December 2011. I think it is still too early to tell but everyone is welcome to take a guess! Thanks.
PS - They spend all day outside so they're never in a presentable fashion please excuse their mess!
My guess is the same as Angela's. Left - male, right - female. When my male was the size of Dwight he began "flashing", removing all doubt as to his gender. At this point it is really only a guess.