Both 60mm and 100/105mm macro lenses work well, but 100/105mm focal lengths may be preferable as they have a greater working distance. If you are using an SLR camera, a macro lens that can achieve 1:1 magnification should be your tool of choice. As a rule you want to get as close as possible to the subject without spooking the octopus into retreating into his shelter, it might take several minutes for him to re-emerge wasting precious time and air. But if you find one that is a dime to golf ball size, switch to macro mode. Such behaviour is regarded by biologists as the first documented example of tool use by an invertebrate.If you are using a compact camera, you can stay with the standard settings if the coconut octopus is one of the larger softball size animals. In 2009 biologists reported having observed the animals excavating coconut half shells from the ocean floor and carrying them for use as portable shelters. The veined octopus ( Amphioctopus marginatus) is also known for its intelligence. Each pigment-bearing cell ( chromatophore) is individually innervated from the brain. vulgaris has highly developed pigment-bearing cells and can change its skin colours to an astonishing degree with great rapidity. This species is thought to be the most intelligent of all invertebrate animals. It feeds mainly on crabs and other crustaceans. It lives in holes or crevices along the rocky bottom and is secretive and retiring by nature. vulgaris, a medium-sized animal that is widely distributed in tropical and temperate seas throughout the world. The best-known octopus is the common octopus, O. Know how colorblind cephalopods like octopuses and squids know what colors to change to hide from predators or to attract mates See all videos for this article
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