They all use camouflage (KAM-uh-flahj), the ability to blend in or resemble an element of your surroundings. The octopus's coloring matches the sandy area it is lying on, while the sea dragon's body resembles the algae in its environment. As its name suggests, the stonefish looks like a harmless stone, but anyone unlucky enough to step on it will discover the stonefish's venomous spikes.