Hunter R/biology

The Hunter R series was noticeably an ectothermic species, being "cold-blooded" and so dependent largely on the climate to assist in their metabolism. This can be seen in how they began brumating in the Raccoon City Underground Research Facility when the temperature was lowered, entering dormancy as frost gathered on their bodies. When the temperature on the level increased, they woke up and shattered the frost covering them.