angry bird cake

When my friend Tash asked me to bake her son, Noah, an angry bird cake, I was a little confused.  Why? And what kind of bird is angry? What makes birds angry? I think I've seen an angry ostrich.. it's all a little bit weird.  But then I didn't even really know what an app was.  I know. I live in Africa?  Weak excuse.  But I did some research and this is the result!  This is pic she post on her blog, 'dear me'.  Take a peek.
ps i have a lot of APPS now.