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Photographs: © Karen Willshaw/OceanwideImages.com (day octopus); © Rudie Kuiter/OceanwideImages.com (paper nautilus, blue-ringed octopus); © Doug Perrine/SeaPics.com (Hawaiian bobtail squid); © Dario Sabljak/Shutterstock (octopus arm); Chris Newbert/Minden Pictures/National Geographic Stock (mimic octopus); © WaterFrame/Alamy (octopus in bottle); © Kelpfish/Shutterstock (coconut octopus); © Aleksandrs Marinicevs (squid)
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