Spot-fin Porcupinefish, Diodon hystrix
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The spot-fin porcupinefish (Diodon hystrix) can inflate into a ball when highly stressed. In such a situation its spines would stick straight out for defence.
The spot-fin porcupinefish (Diodon hystrix) can inflate into a ball when highly stressed. In such a situation its spines would stick straight out for defence.