Bears'sense of smell is dependent on a Jacobson's organ, or vomeronasal organ, which allows the bear to easily detect airborne scents.
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Some whales, such as the bowhead whale, possess a vomeronasal organ, which does mean that they can " sniff out " krill.
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In animals, certain natural plant odors appear to activate the vomeronasal organ ( VNO ), which appears to control hardwired, innate responses.
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However, most investigators have sought to identify the opening of the vomeronasal organ in humans, rather than identify the tubular epithelial structure itself.
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Scientists had known of the nasal structure, called the vomeronasal organ, on each side of the nasal septum, for more than a century.
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The olfactory lobes are absent in toothed whales, and unlike baleen whales, they lack the vomeronasal organ, suggesting they have no sense of smell.
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Dulac said the vomeronasal organ might have atrophied in higher primates as they came to rely on sight to tell males and females apart.
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Over the years, many people have suggested that this so-called vomeronasal organ detects pheromones, but researchers say there is no solid evidence of that.
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Thus it has been argued that such studies, employing macroscopic observational methods, have sometimes missed or even misidentified the vomeronasal organ . [ 21]
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When a mammal smells the new compound in human sebum with its vomeronasal organs, its amygadala subconsciously makes the animal want to attack the humans.
