**Description:** A bottom-dwelling fish with a large head and fan-like fins, perfectly camouflaged against river stones.
**Size:** Typically 3 to 5 inches long.
**Behavior:** Lacks a functional swim bladder, allowing it to sit perfectly still on the stream bed. They "hop" along the bottom rather than swimming.
**Identification:** Features a mottled, "sandy" color pattern. They are important predators of aquatic insect larvae.
**Habitat:** Clear, cold, fast-moving mountain streams with gravel and cobble bottoms.