One of Visser threes morphs. It fires razzor sharp projectiles made of a bone like substance. These rapidly regrow so that it can fire again.
It is carnivorous and kills its prey with the spikes. They are subsentient, but have the intelligence level of a Gorrila. The Yeerks do not infest them because of their brain design, it makes control quite difficult. On top of that, they are few in number.