A mollusc peeks out from its shell amid a swirl of plankton. But look again. It’s certainly a clam shell, but those suckers are a clue that the animal tucked up inside is no clam. It’s a veined octopus, a rare example of a soft-bodied animal that can walk on two ‘legs’, freeing up the other six to use as camouflage or carry its home around. Traditionally, this octopus's shelter of choice would be an empty bivalve shell, but in the Molucca Sea of Indonesia, it has been diversifying its portfolio to include discarded coconuts.