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Veined octopus (Amphioctopus marginatus) resting on top of the two halves of an old
Veined octopus (Amphioctopus marginatus) resting on top of the two halves of an old clam shell on the sandy seabed. These octopus regularly carry pieces of shell so they can use them as protective armour if required. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea
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Mantis shrimp (Odontodactylus scyllarus) crawling on the seabed. Despite its name this is neither a mantis or a shrimp, instead being a crustacean only distantly related to the true shrimps. It is an active predator, and uses its club-like front limbs to kill prey. It mainly feeds on crabs and molluscs, breaking open their shells with blows from these clubs. A mantis shrimp strike is one of the fastest animal movements in the world, with a force similar to that of a low-calibre bullet. The eyes of the mantis shrimp are the most complex in the world, containing as many as 16 different types of photoreceptor (compared to four in humans). Photographed in Lembeh Strait, North Sulawesi, Indonesia
© GEORGETTE DOUWMA/SCIENCE PHOTO LIBRARY