Researchers from Japan's Chiba Institute of Technology demonstrated this spherical robot that rolls around until its four legs pop out for scurrying. Like a quadruped robot disguised as a Spheero! From the scientific paper (PDF):
We have proposed and developed a new quadruped walking robot with a spherical shell, called "QRoSS". QRoSS is a transformable robot that can store its legs in the spherical shell. The shell not only absorbs external forces from all directions, but also improves mobile performance because of its round shape. In rescue operations at a disaster site, carrying robots into a site is dangerous for operators because doing so may result in a second accident. If QRoSS is used, instead of carrying robots in, they are thrown in, making the operation safe and easy. We developed QRoSS-I and conducted basic experiments to verify performance which includes landing, rising and walking through a series of movements.
(via IEEE Spectrum)