Huge flock of Rusty Blackbirds making a racket
call at beginning of recording before dog started barking
This guy was recovering, but striking a building can result in head injury. Brain inflammation, often fatal, may not occur immediately, enabling the bird to fly away. Scientists have found that many of these later succumb to their injuries. Guys like this are easily treated in rehab - sometimes just a precautionary anti-inflammatory plus R&R before a quick release, usually the same day.