In North America up to one billion birds fatally collide with windows annually. According to the American Bird Conservancy, each US home kills about two birds per year. In New Zealand, little is known about how many birds come to harm from window strike, but we know it is a big problem for many native birds, particularly birds such as riroriro, tauhou, kererū and ruru.
The purpose of this new Urban Wildlife Trust project is to better understand the extent of this issue in New Zealand and to ascertain the effectiveness of bird strike mitigation approaches for New Zealand conditions.
About Window Strike
Windows are essentially invisible to birds, and collisions occur as birds try to fly through reflections of open space and plants. Worldwide the annual number of birds killed by collisions is estimated to be in the billions. But this is an avoidable problem, and a number of studies (see examples) have looked into the effectiveness of different window treatments – everything from etching, opaque barriers, Zen window curtains, UV coating, and markers. These are predominantly North American studies and the issue has received little if any, research in New Zealand.