These cute aliens from the Star Trek universe are the perfect pets; smooth and playful.
With sound effects and vibration, responds to strong touch. The classic tribbles (gray, beige, light brown, dark brown, pink) alternately give a purr and a fearful quickening. The mutated tribbles (dotted and striped) only make a sound.
The still young Tribbles need a little pat to scream out loud, while the big, full-blown Tribbles (from another range) are quite scary and respond to mere sounds or light touch.