They have no wings. Their eggs have been stolen by pigs. So, yeah, they're pretty angry. Contemplate their mood at length with our free Angry Birds theme for Windows 7.

Editor's note: We usually do not post themes but we love Angry Birds. Windows 7 themes can only be used in Windows 7 Home Premium, Professional, Enterprise, or Ultimate editions. Simply double click the file (AngryBirds.themepack) to install.