Mac and Hamlet are two completely different birds, Mac will talk, if only to mimic (which I think is great for a GCC) and Hamlet, well, Hamlet I don't think CAN actually vocalize too well.
Mac's vocabulary is growing, I think we are up to 7 - 10 words now including "gimme a kiss" "Hammie" "Thank you", "Good Bird" and "night night" which are used on a regular basis ... night time roll is great fun with Mac ...
Hamlet on the other hand, doesn't talk ... we have to watch body language and squeaks and sqwaks to figure out what he wants ... 9 times out of 10 it is pretty easy to figure ...
Now, here is something else interesting that will, HOPEFULLY, spawn more discussion ... Hamlet and Mac are treated the same way here, cuddled the same amount, exposed to the same environment and given the same amount of attention. Now, why is it that Mac will vocalize and Hamlet will not ... could it be a "Nature" thing or could it be that Mac was given more handling, interaction, attention as a baby/fledgling than Hamlet was?