Why a plastic bag on wing mirrors can stop territorial birds in France

In France, a simple trick seen on some vehicles is intended to prevent a surprising dispute between territorial birds and their own reflections.

Published on 6 June 2025, the information reported by the original media outlet, whose name is not given in the supplied extract, concerns an easy measure: covering exterior wing mirrors when a bird repeatedly attacks a parked car.

A reflection mistaken for a rival

A plastic bag tied around a wing mirror may look amusing at first. However, it is a response to a very real situation, frequently seen in spring and early summer. At this time of year, several bird species actively defend their territory, nesting area or mate.

The issue arises when the bird sees its image in the mirror’s reflective surface. It does not necessarily identify the image as its own reflection. Instead, it may perceive another bird occupying its territory and posing a threat.

“The wing mirror is not the target itself: it is the reflection it produces that triggers the bird’s reaction.”

The French League for the Protection of Birds explains that territorial behaviour can become more intense during the breeding season. Some males then attempt to drive away any individual they regard as a competitor. When faced with a car mirror, they may repeatedly peck, beat their wings and scratch.

This behaviour can continue for several hours and recur over a number of consecutive days. The bird returns to the same spot, finds what it believes to be its rival and resumes the attack. Cars parked near hedges, gardens, trees, farmland or buildings containing nests may be especially affected.

Damage can be more noticeable than expected

The first signs are generally visible on the wing mirror housing and glass. Claws and beaks can leave marks on the plastic. With repeated contact, the mirror itself may also shift or become loose.

Bird droppings are another nuisance. They are not merely unsightly: they can contain uric acid, which may damage the lacquer if left on the bodywork for a long period, particularly in hot weather or direct sunlight.

The level of risk depends on how long the droppings remain on the vehicle, the condition of the paintwork and the weather. Prompt, gentle cleaning helps prevent marks. By contrast, rubbing dried droppings with a rough cloth can cause fine scratches.

• Scratches may develop on the plastic and glass of the wing mirror.
• Repeated impacts can weaken the mirror mechanism.
• Droppings left on the car body can mark the lacquer.
• The bird may return every day for as long as it can see its reflection.

Covering the wing mirror to stop the cycle

The suggested solution is to fully conceal the reflective part of the wing mirror with a plastic bag. The purpose is not to scare the bird away. It is to remove the trigger: its image in the mirror.

Once the reflection is gone, so is the supposed rival. The bird therefore has less reason to land in the same place and strike the glass. A shopping bag or small plastic bag may be enough, provided that it fully covers the mirror and remains secure in windy conditions.

“This temporary protection works by removing the reflection visible to the bird, rather than trying to drive it away.”

An elastic band or a knot can hold the bag around the mirror housing. It is essential to remove this cover before driving. A covered wing mirror greatly reduces the driver’s side visibility and must never remain covered while the vehicle is in motion.

A temporary measure that does not harm the bird

A plastic bag is a short-term response. It can be fitted when the car is parked for several hours or overnight, then removed before any journey. This approach avoids using repellent products whose effectiveness and effects on wildlife are not always known.

It is also important not to try to catch the bird, move a nest or destroy eggs. In France, many species of wild bird, along with their nests and eggs, are protected. If a nest creates a difficulty, it is better to seek advice from a qualified association or the relevant authorities before taking any action.

What the rules require in France

In France, exterior wing mirrors must allow the driver to monitor the sides and rear of the vehicle. Covering them can only be useful while the vehicle is stationary. Before setting off, the driver must remove the bags and check that the mirrors are correctly adjusted.

Wildlife protection also calls for a cautious response. A bird attacking its reflection is not trying to attack people or the car itself. It is responding to a visual stimulus as part of territorial behaviour. Concealing the reflective surface can therefore reduce the issue without unnecessarily disturbing the bird.

Practical steps around the vehicle

Where the attacks are repeated, the driver can note when they occur and check whether another reflective feature is also attracting the bird: a side window, shiny wheel trim, highly polished bodywork or a window close to the parking space.

Parking in a slightly different location may sometimes be enough to break the bird’s routine. Both wing mirrors can also be temporarily covered, even if only one appears to be targeted, to prevent the bird from switching its attention to the other side of the vehicle.

Finally, the plastic bag should not become discarded litter. Once removed, it can be reused or disposed of through the appropriate waste stream. The tip is economical, but it only makes sense if it protects both the car and its immediate environment.