Balls of Fur

From Muppet Wiki

Balls of Fur are roly-poly, fuzzy creatures with long, thin legs typically covered in striped socks. Usually appearing in sets of eight, these silent dancers come in a wide variety of colors and are known for their agility. Described as being as bushy as a lion's mane, and as curvy as a drop of rain, they have a soul for rock n' roll. Most famously, they were the subject of Little Chrissy's song "Eight Balls of Fur."

No relation, if any, is known to the Muppaphones, a similar species of furball seen on The Muppet Show.