Why do birds keep flying into my windows?

Birds may mistake a reflection of trees or sky for somewhere they can fly, see a clear route through the glass, or react to their own reflection as another bird. Those are different situations. Start by looking at the window from outside and noticing what the bird is approaching, rather than assuming the glass only needs one bird-shaped sticker.

White flying tui window decals on glass. — YDS Flying Tui product imagery. The decorative arrangement is not a verified full-window collision-prevention layout. Window Strike Flying Tui Decals.

Is it a collision or a bird returning to its reflection?

A sudden impact during flight is different from a bird repeatedly landing nearby, pecking or fluttering at one spot. The US Geological Survey explains these three causes: reflected habitat, apparent fly-through routes and territorial responses to a reflection. The distinction helps describe the problem when you ask for advice; it does not make a hard impact harmless.

If a bird is on the ground after a strike, deal with its welfare before shopping for window treatments. Keep pets away and seek local rescue advice. For native wildlife in New Zealand, follow DOC’s current injured-wildlife guidance.

Look at the glass, not just through it

Stand outside at a safe distance and compare the view from several positions. Does a pane show the tree opposite? Can you see through a corner or two facing windows to vegetation beyond? Photograph the whole pane as well as the area where impacts have happened. A close-up of the sticker already on the glass will not show the rest of the problem.

The Cornell Lab of Ornithology’s collision guide describes both reflected habitat and transparent routes. Its examples explain why a window that seems obvious to a person indoors can present a very different picture from the approach outside.

Flying tui decal shapes arranged on a window. — Look beyond the motif: reflections and the untreated gaps across the rest of the pane still need assessing. Window Strike Flying Tui Decals.

The white tui shapes supplied in a Flying Tui decal pack. — Pack artwork helps identify the shapes supplied, but pack count alone cannot establish coverage for your glass. Window Strike Flying Tui Decals.

Separate the artwork from the coverage plan

Closely spaced, clearly visible exterior markings help birds recognise the glass as a barrier or obstacle, rather than an open flight path. This depends on suitable contrast and coverage across the whole pane; isolated decorative stickers are not a guarantee against collisions.

YDS Flying Tui Window Decals provide white bird motifs, with different-sized shapes in the pack. That describes the artwork supplied—not a tested coverage area for every window. A sparse decorative arrangement can still leave substantial sections of apparent open space.

For collision reduction, the important discussion is the full exterior treatment: visibility, contrast, the largest clear gaps and the edges of the pane. Do not assume a bird shape works because it resembles a predator or because a product photograph looks attractive. Ask how the complete proposed layout addresses the glass you actually have.

Make a useful record before choosing a treatment

Which pane is involved, and whether it is fixed glass or a moving door.
What you can see reflected or through the glass from outside.
Whether there was a flying impact or repeated pecking at one area.
The approximate time, light conditions and any existing window graphics.

Bring that record and the pane dimensions when you contact YDS Studio. The first goal is to understand the hazardous view, then choose a suitable whole-pane approach—not simply add another isolated decoration.