# Butterflies trick predators with wing illusions

> Butterflies use wing motion to confuse predators, study finds.
- Title: Butterflies trick predators with wing illusions · the Guardian
- Summary: Butterflies use wing motion to confuse predators, study finds. Butterfly wing patterns create motion illusions that distract birds from attacking them.
- Keywords: butterfly, wing patterns, motion illusion, predator avoidance, butterfly wings, bird predators, exeter university, essex university, swallowtail butterflies, nature journal, science, Butterflies
- Source: the Guardian — https://theguardian.com/science/2026/sep/30/how-butterflies-avoid-being-eaten-by-predators-wildlife-insects
- Published: 2026-09-30T15:00:43+00:00
- Read time: 1 min
- Topics: butterfly, wing patterns, motion illusion, predator avoidance, butterfly wings, bird predators, exeter university, essex university, swallowtail butterflies, nature journal, science
## Butterflies evade birds with visual tricks
British ecologists found butterflies use wing motion to confuse predators by scrambling their speed and direction.
## Wing patterns create motion confusion
Swallowtail butterflies deploy shifting stripes that change angle and point as they fly, creating misleading motion.
## Illusions disrupt predator attacks
The illusions interfere with predators' visual targeting systems, causing birds to miss or strike less vulnerable wing areas.
## Butterfly wing illusions compared to barber pole
Researchers compared the effect to the barber pole illusion where stripes appear to move upward even though the pole spins in place.
## Swallowtails excel at motion confusion
Swallowtail butterflies have tails that increase motion confusion and show signs of bird attacks with missing tails and beak-shaped holes.
## Human volunteers test motion illusions
100 human volunteers acting as predators struggled to catch virtual butterflies on a touchscreen.
## Study published in Nature journal
The study on butterfly wing patterns creating motion illusions was published in the journal Nature.
## Key takeaway

Butterfly wing patterns create motion illusions that distract birds from attacking them.