PROGRAMMING CHALLENGE: Create a nighttime scene where an owl appears and flies across the screen. Constraints: 1. When the tree is clicked, a owl arises from the tree, gets bigger, and flies off the screen. 2. The owl should increase in size as it flies across the screen. 3. When the owl appears, a hoot sound should be played. 4. When the animation is completed, it should be able to be restarted by clicking on the tree. *VERY DIFFICULT* EXTENSION CHALLENGE: Once the animation has started, additional clicks on the tree don't affect it until it's finished.
