My theme is Creatures in Paranormal Fiction.
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S is for Shifter aka Shapeshifter.
Shapeshifters are creatures in folklore and fantasy fiction who can transform into another being or occasionally an object. The most common shifter in current fiction is the werewolf, but other popular forms are werecats (panthers, lions, tigers). The variety seems to be limited only by the imaginations of authors and filmmakers. Snakes, rats, bears, dragons have all been written. I haven't yet seen an elephant, but that could be next year's big rage. :)
Check out this Goodreads discussion group for a list of shifter series: https://www.goodreads.com/topic/show/348876-were-shifters-books or this list: https://www.goodreads.com/shelf/show/shapeshifters.
See also L is for Lycan (April 14 blog post).