Snakes' appearances linked to how scary or appealing people find them

Most people fear snakes. The reasons could vary. 

So researchers tried to comprehend this problem. 

They found  that Snakes' appearances are somewhat responsible for the initial reactions. 

Snakes can elicit a wide range of human responses, including fear, disgust, awe and admiration. Past studies suggest that both humans and nonhuman primates, such as monkeys and apes, tend to quickly notice snakes in their surroundings.

Researchers recently carried out a study exploring the possible link between the physical characteristics of snakes and how people view them. Their findings, published in a paper in Proceedings of the Royal Society B, suggest that similar-looking snakes elicit similar reactions of fear, disgust and positive impressions.

Fast visual detection of something as a snake is not necessarily the same as being afraid of it. This led the researchers to a simple question: what makes some snakes appear more threatening than others once we actually look at them?

In a review paper published in 2025,   researchers examined past experimental evidence suggesting that different visual characteristics of snakes can become important at different stages of perception.

From an ecological perspective, this makes sense: a slender colubrid, a broad-headed viper and a large constrictor may all be snakes, but they provide very different visual information.

This new study study asked whether different snake morphologies and visual characteristics could help explain these differences in emotional and aesthetic responses, and how these responses interact with individual experience and ecological or cultural context.

The researchers found that the participants' of the experiment snake ratings could be broadly categorized into three groups, each marked by different morphological characteristics. The first group was associated primarily with fear, the second with positive impressions and the third mainly with disgust.

How appearance and experiences relate to snake fear

Overall, the team's findings suggest that people rely on specific morphological and visual cues when evaluating the potential threat associated with snakes. The characteristics identified by the researchers appeared to play a role in evaluations even when people had no knowledge of how dangerous a specific snake is.

These cues may therefore work together as a kind of visual threat heuristic: the perceptual system may use aspects of an animal's appearance as a shortcut for evaluating potential danger.

This could help explain why harmless species that visually resemble more threatening snakes can nevertheless be perceived as highly threatening. This was reflected in the groups that emerged from participants' ratings.

The researchers found that vipers and several boa species were linked with higher fear and arousal, while several slender colubrids and dipsadids were viewed more positively. Smaller fossorial snakes and some non-snake limbless reptiles appeared to elicit disgust.

Importantly, these patterns did not simply track actual danger. From an evolutionary perspective, this is consistent with a perceptual system that favours caution over perfect accuracy when the potential cost of failing to recognize a genuine threat is high.

While the shape and appearance of snakes appeared to play a role in how people rated them, they did not fully explain the responses. The researchers observed that fearful reactions were also heavily influenced by reported encounters with snakes and people's general fear of snakes.

Visual characteristics seem to help structure which snakes are perceived as relatively threatening, while individual factors help determine the intensity of that response.

Together, these findings suggest an interaction between relatively shared perceptual biases and individual experience, rather than a rigid or entirely innate fear response.

Also, this study reinforces the idea that people's relationships with snakes cannot be reduced to fear alone. Instead, human responses to snakes appear to be highly varied and influenced by a wide range of factors.

Luiz Biondi et al, From fascination to fear and disgust: cross-cultural assessment of emotional and aesthetic responses to snake imagery, Proceedings B (2026). DOI: 10.1098/rspb.2026.1328.