Watch: Taxidermied Robot Sparrow Flips The Bird To Real Sparrows

Further research has been halted after the robot's head was ripped off by angry birds. Male sparrows do indeed get angry, especially when another male is intruding on his territory. Angry birds can fight to the death in whirling masses of feathers and beaks. But sometimes a bird would rather try to bluff and scare off a potential foe, using rude wing gestures to show it's ready to fight and welcomes the challenge (although it might not). To study this in more detail, scientists at Duke Universit...