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Porcupine.pufferfish.arp. Porcupine pufferfish Diodon holocanthus at Bristol Zoo Bristol England On the right is Bluespotted grouper Cephalopholis argus and partially hidden on left Picasso triggerfish Photographed by Adrian Pingstone Adrian Pingstone Arpingstone Diodon holocanthus Cephalopholis argus Bristol Zoo Gardens Aquarium