The Turakina Bird Rescue Centre is doing its bit to prevent native kereru, or wood pigeons, from being injured or killed by hitting windows.
But the organisation needs funding to continue the good work.
Dawne Morton from the rescue centre said she had sold out of the special stickers that were designed to prevent kereru from flying into windows. The stickers are placed on a window and, although they look like a faint smudge to human eyes, they contain UV light which is visible to birds and repels them.
Ms Morton said the stickers were very popular but "we have to import them from the United States and it costs $250 at a time. For an organisation like ours, that's a lot of money".
The rescue centre takes in around 70 kereru a year that have been injured by flying into windows. Many more are killed. "If they hit the window head-on they'll die, but if they pull up just before they hit they're more likely to have broken bones."