Oh, crap, it gets even worse. Turns out the Chewbacca from Episode VI is not even the same Chewbacca as Episodes IV and V. Han Solo burns through them like disposable razors, and just goes to Kssskykk every so often where he buys a new one, just like a whore.
Here's where it gets confusing. I guess the Chewie from A New Hope and Empire are the same Wookie, but the one from Episode III and Return of the Jedi are a different one, who is RELATED to the other Chewbacca. But only by marriage. I swear, George Lucas sure does like to screw up these movies!