Zhu Zhu Baby hamsters have a roller ball under their tummy to rock and roll around when nudged. Butter Cheeks is a yellow hamster with a pink diaper, and comes with three "baby" accessories.   
  — As of 8.16.10, this product had 5 out of 5 stars from 3 reviews on ToysRUs.com and was listed No. 26 in best-selling toys and games. PROS: Durable, easy to control, realistic movements.