A stingray's nightmare

Stingrays are well camouflaged against the sand but hammerhead sharks have adapted electroreceptors in their broad heads to detect them on the sea floor. Their second line of defense is a venomous barb but a hammerhead was once found with 96 barbs in its body and was apparently unaffected. There's very little a stingray can do in the commotion of an attack.

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