The rock gunnel is about 10 inches (25cm) long. Rock gunnels live in temperatures between 37 degrees and 82 degrees. The rock gunnel eats small invertebrates . The rock gunnel is also very unique in different ways . It can hide easily form predators by hiding in seaweed or under shells. Another way is that it can camoflage . If an animal can camouflage itself it can easily escape the wrath of a animal.