The birds go crazy - they fly over a factory built on the outskirts of a small town and begin to destroy each other. There is an outbreak of an unknown virus among workers. The infection spreads beyond the gates of the factory, which alarmed residents are demanding to close, blocking deliveries and sales of products. There are more dissatisfied people after other animals begin to self-destruct after the birds. Squirrels and wild cats tear each other apart. Pets and people are next...