The stars of Zootopia are all animals, and SeeedStudio wanted to wear smart ears when she cosplayed as Nick Wilde and Judy Hopps from the animated film. She got the fox and rabbit ears from plush toys (you can probably track down some secondhand stuffed animals at your local thrift shop) and fitted them with electronic modules made of servos and batteries. Watch the above video to see ear construction.
You can get details on the full process with more pictures at Instructables.
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