The recently released "Harry Potter: The Creature Vault" is a compendium of the monsters and apparitions that populate the Wizarding World. The book is chock full of concept art and illustrations from the films, focusing on how the artists managed to bring to life the fantastical beasts that had previously only existed in readers' imaginations:

 

Peter Pettigrew (SPOILER ALERT?)

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Buckbeak

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Merpeople

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Nagini (aka "The Silliest Horcrux")

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Grindylow 

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Arnold the Pygmy Puff

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