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To keep the bunny ears standing up, you need to add wire support. Use a pair of wire cutters to cut two pieces of 20 gauge hobby wire. Each piece should be long enough to form into an outline of the bunny ears with at least 5 inches (13-cm) of excess on either side of the bottom.  You can find 20 gauge hobby wire at most craft stores. You can substitute floral wire if you prefer. Once you’ve cut the pieces of wire to the proper length, use your hands to carefully bend it into roughly the same shape as each bunny ear. The wire forms should be slightly smaller than the darker felt ears.

Summary:
Cut two pieces of wire. Bend the wire into the same shape as the felt.