Pesticides, Continued: A Lot of Dead Birds

Estimated number of birds killed in North America each year by:

Feral cats: 1.4 billion to 3.7 billion (source).

Insecticide poisoning: 67 million (source).

Collisions with buildings: 100 million to 1 billion (source).

It’s amazing there are any birds left to sing each spring. — Tom Andersen, director of conservation and community outreach.