Description: Scarecrows are not enough to drive these blackbirds away, and you should scare them away by placing in the tower defense game Ravens! Your job is a gatekeeper, and you should not let any of these ravens to pass through to fulfill your job. These birds will be swarming in droves, determined to bring down your gate, and when it is destroyed, then you fail the level. There are upgrades available for you called 'stocks' and these stocks can only be bought and upgraded when you have enough money which you collect by successfully frightening ravens away. You can sell your owned stocks to make way for new and more needed ones.