"So this busted the myths of the movies that sharks are these ruthless killers that just go crazy if they smell a drop of your blood." MEL BREAKS LOOSE Sharks have been called “swimming noses” because their sense of smell is so good (they smell with their nostrils but don’t breath through them). He also said that their findings "busted the myths of the movies that sharks are these ruthless killers that just go crazy if they smell a drop of your blood." A shark's sense of smell functions up to hundreds of meters away from a source. The experiment was conducted with three surfboards - each containing something different. Most read in News. Sharks have all the senses we have (smell, taste, touch, eyesight, and hearing). In the now-viral 18-minute video, Rober said it's also "really hard to legally find five gallons of human blood." As fierce as they may be, pound-for-pound, great white sharks do not have the strongest bites in the ocean. What is likely happening is that the sharks can smell the blood but it’s just not in a quantity that is interesting to them especially since they don’t love human blood that much (btw, I spoke with a marine biologist and mammal blood is all the same from a chemical marker stand point so cow blood is a suitable substitute for human blood). Humans have a few things we can smell in a few parts per billion, skunks being a good example. Some sharks can smell one part of blood in 100 million parts of water and can tell which direction that smell is coming from. Cool Love sharks, here we go: So as others have stated sharks do have a great sense of smell and can detect very small amounts of blood in the water, talking a few parts per billion. Sharks have an acute sense of smell. It can detect one drop of blood in a million drops of water (25 gallons or 100 liters) and can smell blood 0.25 mile (0.4 km) away. They can also sense electricity and vibrations in the water. Sharks, for example, can’t actually detect a single drop of blood in the ocean from miles away (in certain conditions, the best they can do is sniff out blood at one part per million). They are well-known for their ability to detect minute quantities of substances such as blood in the water. As for blood, it likely does not render a piranha senseless as the movies would suggest, but piranhas can smell a drop of blood in 200 liters of water. Most read in News Exclusive They are peaceful and ill equipped to defend themselves from more aggressive fish like sharks and Oscars. He also said that their findings "busted the myths of the movies that sharks are these ruthless killers that just go crazy if they smell a drop of your blood." However, cow blood was used instead of human blood because “all mammal blood essentially smells the same to sharks," Rober explained. SMELL A shark's primary sense is a keen sense of smell. 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