For a long time, the public has believed that the irritating odour emitted by sulphur can interfere with snakes' sophisticated and sharp olfactory system just as it interferes with precision instruments, thus forcing snakes to stay away from areas sprinkled with sulphur as if it were a "forbidden zone". Snakes rely heavily on their sense of smell to sense their surroundings, and their tongue acts as a 'highly efficient sampler', stretching to collect free airborne chemicals. These substances are then accurately delivered to the nasal plough at the top of the mouth, which acts as a 'specialist analyser', analysing the collected chemicals in depth to construct a picture of the world around them.
However, if you look beyond the surface, this widely circulated theory lacks solid scientific support. The olfactory system of snakes is very different from that of mammals, and its structure and mechanism of operation contain many complex mysteries. Their sensitivity to odours and their unique response patterns are far from being summarised by a simple 'stimulus-response' model. Whether the smell of sulphur can actually cause snakes to actively avoid it is still an open question in the field of science that needs to be rigorously verified, like a mysterious puzzle hanging on the path of scientific discovery that researchers are eager to unravel.
Sulfur has shown potential to repel some snakes under certain circumstances. Some snakes are more sensitive to the smell of sulphur. However, this repellent effect is like a candle in the wind, extremely unstable, and is highly influenced by environmental factors. Changes in humidity, wind direction, temperature, and any other subtle environmental variables may lead to ups and downs in the repellent effect.
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