The drug has also infiltrated various forms of aquatic life, including mollusks, crustaceans, and bony fish.
But with all that said, no studies had ever looked into whether sharks are affected.
They noted that many shark species are facing serious decline due to overfishing.
Researchers found traces of cocaine in Brazilian sharpnose sharks, a close relative of the Atlantic sharpnose seen here.© E. Woodward, UNC Institute of Marine Sciences via Flick Creative Commons
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And in a new study Friday, researchers have found that some of these bites are wholly defensive.
