The Batzu is a Maxis made early creature, present in the final game. They are small, slug-like creatures with many spikes. They are very simple creatures, and are newly evolved from the ocean.
Batzus are herbivorous creatures and will only fight for self defense. They can deal a weak bite at the enemy, and can also charge at it, dazing it for a few moments.
Their only mean of socializing is by singing, but their mouths aren't evolved to sing well. Apart from the spikes, Batzus have no other special features.