Resources
Study – “Direct Mortality of Birds from Anthropogenic Causes”
US Fish and Wildlife Service – “Threats to Birds”
According to the U.S. Fish and Wildlife Service, the leading causes of bird mortality are:
- Cats – 1.4 billion to 2.4 billion
- Collision with building glass – 365 million to 599 million
- Collision with vehicles – 89 million to 214.5 million
- Poison – 72 million
- Electrical lines – 8 million to 25.5 million
- Communication towers – 6.6 million
- Oil pits – 500,000 to 750,000
- Land based turbines – ~140,000 to ~234,000