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[[Image:795px-Black-spotted puffer arp.jpg|thumb|A puffer fish at Bristol Zoo, Bristol, England.]]
[[Image:fish.jpg|thumb|A puffer fish at Bristol Zoo, Bristol, England.]]
'''Pufferfish''' are a distinctive family of tropical and sub-tropical marine fish, also known as blowfish. It is called the puffer fish because when it is threatened, it puffs up to about twice its normal size by gulping [[water]]. In this engorged state, the puffer fish can swim at only about half its normal speed.
'''Pufferfish''' are a distinctive family of tropical and sub-tropical marine fish, also known as blowfish. It is called the puffer fish because when it is threatened, it puffs up to about twice its normal size by gulping [[water]]. In this engorged state, the puffer fish can swim at only about half its normal speed.