Butterflies use optical illusions to dodge predators
Researchers from the University of Exeter have discovered that butterflies use optical illusions to confuse predators during flight. The study demonstrates that wing patterns create misleading motion cues, similar to the barber-pole effect, which cause attackers to miss or strike less vulnerable areas. This finding suggests that motion confusion is a significant evolutionary driver for butterfly wing patterns and may be widespread in other animal species.
- ▪Butterfly wing stripes shift angle during flight, creating motion illusions that mimic the barber-pole effect to mislead predators.
- ▪High-speed filming and computer simulations revealed that these patterns cause predators to perceive incorrect movement directions.
- ▪Volunteer experiments and evolutionary simulations confirmed that patterns inducing motion confusion are selected for in nature.
- ▪The study indicates that motion confusion is likely a common defensive strategy in various animals, including zebras and snakes.
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| Original publisher | Ac |
| Canonical URL | https://www.essex.ac.uk/news/2026/09/30/butterflies-use-optical-illusions-to-dodge-predators |
| Publication time | Thu, 01 Oct 2026 23:15:24 +0000 |
| Retrieval time | 2026-10-02T01:25:19.210Z |
| Last seen | 2026-10-02T01:25:19.210Z |
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Barber-pole effect The underlying mechanism works much like the 'barber-pole illusion' – the red-and-white striped pole outside barber shops, where the stripes appear to travel upward even though the pole is only spinning in place. "Butterfly wings deform as they fly – clapping together on the upstroke and peeling apart on the downstroke – so their stripes shift angle and point in different directions as they flap," said Dr Jolyon Troscianko, also from the University of Exeter. "Combined with their unpredictable flight paths, this patterning creates misleading motion illusions just like the barber-pole, causing a predator to miss entirely, or to strike a less vulnerable part of the wing, such as the hindwing or tail.
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