The venomous spined Rock Scorpionfish (Scorpaena mystes) can change colors to blend with its background. 
Isla San Pedro Nolasco, Sea of Cortez, Sonora, Mexico - Depth 35 feet or 11 meters

Isla San Pedro Nolasco - A Sea of Cortez Underwater Photography Gallery

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Underwater Photography at Isla San Pedro Nolasco, Sea of Cortez