The Dolphins of Pern (Dragonriders of Pern)
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When the first humans came to settle the planet Pern, they did not come alone: intelligence-enhanced dolphins also crossed the stars to colonize the oceans of the new planet while their human partners settled the vast continents. But then disaster struck. The deadly silver spores called Thread fell like rain from the sky, and as the human colonists' dreams of a new, idyllic life shattered into a desperate struggle for survival, the dolphins were forgotten...
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