In Canada, window collisions kill 16 to 42 million birds a year. In the United States, collisions kill 365 to 988 million birds per year .
Read moreHow do birds die when hitting windows?
Most birds die from heavy trauma to their brains when they fly into windows. Most birds fly into windows with enough speed to cause severe internal bleeding and brain damage, causing them to bleed to their deaths. Birds do not die immediately after colliding but usually stay stunned for a while before dying soon after.
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