This is made possible by an active articulated torsional drive unit, which in combination with a complex control system attains an unprecedented level of efficiency in flight operation.

FORBES: Festo Builds a Robot Bird

Strokes can damage the complex system if nerves and muscles which control swallowing.

BBC: Princess Margaret: The medical care

Lady Manningham-Buller said the legal system had coped for many years with complex terrorist cases without recourse to "special arrangements" such as control orders, which she described as "terrorist ASBOs".

BBC: Queen's speech debate: Home affairs