I added some more detail to the feet and cotton tails. Also sliced off the edge at the top, to reduce the overhang/better fit an egg shape. I scaled them up about 20% to better fit an average chicken.

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ROBO BUNNY 3000 HOLDs 1 egg. by zello3d @2bitent @planetscore @eddnorris #3dPrinting #indieDev http://www.thingiverse.com/thing:303443

I brought the originals into Sculptris, did a quick addition of toes and a more cottony tail. Then brought it over to Mesh Mixer, sliced off the top edge, and ran a close edges pass it. It didn't seem to do a great job of that, but I'm on my GF's laptop, so I couldn't fix it. They still printed well, just a few holes on the top edge.