Lava rats were small rodent Rahi commonly found in Ta-Wahi on Mata Nui. The lava rat was immune to fire and known for its tendency to burst into flames without warning. An old Matoran legend told of an uneasy trip across water by a Takea shark carrying a lava rat upon its back.1
Notes
The horned lava rat was a creature from Ta-Wahi. Lava rats were known to burst into flames at any moment. There was an old Mata Nui legend about the lava rat.2