Very little is mentioned about Bun-Bun, other than that it is Amy's special stuffed animal. It can be inferred that it is a rabbit. The only information given is that Sophie was describing a picture of she and her sister, saying, "the two of them proudly holding up Ella and Bun-Bun - their special stuffed animals - to the camera" (pg 101 hardcover, Nightfall).
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