GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Black-spotted porcupinefish (Arothron hystrix) inflating itself. The porcupinefish swallows water to inflate itself as a form of defence from predators. The spines on its back ditinguish it from the closely related pufferfish. Photographed in Lembeh Strait, Sulawesi, Indonesia.
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