Sadly birds collide with windows far too often. Audubon estimates that one billion are killed every year. These bird strikes are the second leading cause of death for birds. Outside domestic cats are the first.
These numbers include endangered species as well as backyard favorites like the hummingbird.
As we construct more buildings to meet the needs of humans we make the air space more perilous to birds. Making accommodations in our construction can help save the lives of many birds.