Just a question that has always bothered me:

If Chewie is a Wookie, and Han Solo is a human, what is Yoda? What species is he? Do they ever say in the movies? And, is he the only one of his species? Is there somewhere a Mrs Yoda, or a distant cousin? Or grand father Yoda? It just seems strange to me that he would be the only one of his species in the movies. 

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