Brunswick

Possessing no arms or legs, the Brunswick has one of the more unusual locomotion patterns in the galaxy. It secretes a perfectly spherical shell around itself and moves by changing its internal center of gravity. The only openings in the shell are for its eyes and a combined mouth/anal cavity. If disturbed, it is likely to bite your thumb off and keep it for a snack. It has often been the subject of ridicule for not having sense enough to develop limbs, although some swear they detected a barely-suppressed smirk for the brief period during the Canary Incident when walking became impractical.