Their nine-year cycle starts in a fish form, hatching from the black egg-clusters concealed below the mud. Billions of free-floating slugs emerge, two centimetres long, and are eaten by faster, meaner predators as they gorge themselves on the abundant sludge of decayed vegetation putrefying in the water. They grow and change over three years, losing their tails, developing a snail-like skirt. They cling to the bottom of their lakes, an ovoid body ninety centimetres high, with ten tentacles rising up from the crown. The tentacles are smooth, sixty centimetres long, devoid of suckers, but with a
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