Ever wondered if sharks can sniff out a drop of blood from miles away, like oceanic bloodhounds?

Ever wondered if sharks can sniff out a drop of blood from miles away, like oceanic bloodhounds?

While their sense of smell is incredibly acute, the notion that they can detect a single drop from miles away is more myth than reality. In truth, sharks can detect blood concentrations as low as one part per million, which is roughly equivalent to a single drop in an average-sized swimming pool. This means they can sense blood from up to a quarter-mile away, depending on water currents and the species. So, while they won't crash your beach party from miles out, it's still wise to avoid swimming with open cuts.Science Focus  

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