Underwater photography of seahorses, sea dragons, clownfish, coral reefs, fish & invertebrates by David Hall @seaphotos.com
This small octopus is normally plain brown in color, but can assume a bright, striped pattern with a single blue ring when disturbed. The color change advertises a venomous bite. (Amphioctopus siamensis; Alor, Indonesia)
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Underwater photography of seahorses, sea dragons, clownfish, coral reefs, fish & invertebrates by David Hall @seaphotos.com

This small octopus is normally plain brown in color, but can assume a bright, striped pattern with a single blue ring when disturbed. The color change advertises a venomous bite. (Amphioctopus siamensis; Alor, Indonesia)