Furbies have the ability to dance; they can't walk even though they can have either huge, plastic feet or plastic things that poke in and out through slots under the toy. Also, some may have a base which pushes against a surface repeatedly, rocking the Furby back and forth. A Furby uses any one of these moving parts mainly for dancing. The Furby babies from 2005-2006 can't dance, but can fold and unfold their legs when waking up, or going to sleep.
The Furby Boom app is available on iTunes for the iPhone and on the Android Marketplace for android phones. It is not available to download on a computer.
The colors are:
Lagoona
Punky Pink
Bermuda
Orangutan
Phoenix Red
Rain Cloud
Teal
Multicolor Pink/Teal
Lightning Zap
Multicolor Black/Pink
Sprite Yellow
Green Man
Multicolor Orange/Blue
As low as $1.00 for the common ones, and as high as $500 for the very rare ones. These prices come from eBay US and UK.