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Courage, K. H. (2013). Octopus! The Most Mysterious Creature in the Sea. Penguin Group. ISBN 978-0-698-13767-7. One of the hearts works to pump their blood through their primary body to their organs. Most of these organs are located within what looks like their head but are actually their entire body apart from their arms. The other two hearts function to oxygenate the blood that circles through their body by pumping through their gills.

Everyone knows what an octopus is. But did you know that there are hundreds of species in the world? Some are hundreds of pounds, while others can fit in the palm of your hand. Regardless of the size, octopuses (and their close relatives, squids) come in a rainbow of glittering colors. List of Colorful Octopuses and Squids The Capricorn Octopus gets its name from the shape its arms tend to form around its body. They are smaller octopuses with a mantle that is only 3.1 inches (7.9 cm) long. They are classed as “least concern” on the IUCN list. Ramirez, M. Desmond; Oakley, Todd H. (2015). "Eye-independent, light-activated chromatophore expansion (LACE) and expression of phototransduction genes in the skin of Octopus bimaculoides". Journal of Experimental Biology. 218 (10): 1513–1520. doi: 10.1242/jeb.110908. ISSN 1477-9145. PMC 4448664. PMID 25994633. Turn the orange slightly and repeat 4 times, until you have 4 thin triangles cut into each side of the orange, radiating out from the middle (see step by step photos below or video above).Wait a moment – then eight digits will appear, followed by “kWh” towards the bottom right of the screen. a b c d Marshall Cavendish Corporation (2004). Encyclopedia of the Aquatic World. Marshall Cavendish. p.764. ISBN 978-0-7614-7424-1. Most of these pelagic octopuses live in small crevices, reefs, and even shells if they are large enough. Some make their home on the ocean floor’s depths, living in dark caves instead of lighter surface waters. 3. Octopuses tend to be solitary creatures.

When they do this, they flatten themselves out with the arms streaming out beside them. This shape makes them look like flatfish and helps them continue blending in the sand, hugging the ocean floor so closely that they don’t even form a shadow. 18. Atlantic Pygmy Octopus (Octopus joubini)

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Colorful feature:This squid is shinier than it is bright. Some individuals are silvery-gray or pearlescent. Others are more of a shining rosy red. The thin skin of the octopus absorbs additional oxygen. When resting, around 41% of an octopus's oxygen absorption is through the skin. This decreases to 33% when it swims, as more water flows over the gills; skin oxygen uptake also increases. When it is resting after a meal, absorption through the skin can drop to 3% of its total oxygen uptake. [45] Digestion and excretion Godfrey-Smith, Peter (2018). Other Minds: The Octopus, the Sea, and the Deep Origins of Consciousness. William Collins. pp.77–105, 137–157. ISBN 978-0-00-822629-9.

Myers, Paul Zachary (29 October 2006). "Definitely not safe for work". Pharyngula . Retrieved 18 March 2017.The digestive system of the octopus begins with the buccal mass which consists of the mouth with its chitinous beak, the pharynx, radula and salivary glands. [46] The radula is a spiked, muscular tongue-like organ with multiple rows of tiny teeth. [30] Food is broken down and is forced into the oesophagus by two lateral extensions of the esophageal side walls in addition to the radula. From there it is transferred to the gastrointestinal tract, which is mostly suspended from the roof of the mantle cavity by numerous membranes. The tract consists of a crop, where the food is stored; a stomach, where food is ground down; a caecum where the now sludgy food is sorted into fluids and particles and which plays an important role in absorption; the digestive gland, where liver cells break down and absorb the fluid and become "brown bodies"; and the intestine, where the accumulated waste is turned into faecal ropes by secretions and blown out of the funnel via the rectum. [46] Peel the garlic and chop. Heat another tablespoon of oil in the pan and fry the breadcrumbs and garlic until golden and crisp.