They used to be called the lonely assasins, the doctor says so on the dvds!
If you mean the ones in the episode "Blink" then they are called the "Weeping Angels"Note: they are also known as the "Lonely Assassins" as they cannot touch anything or look at each other.
The Weeping Angels, also known as The Lonely Assassins, first appeared in Series 3 in episode 10, 'Blink', with David Tennant (The Tenth Doctor). Since then they have featured in a number of other episodes; The Time of Angels / Flesh and Stone (S5,E4/5), The God Complex (S6E11), The Angels Take Manhattan (S7E5), The Time of the Doctor (2013 Christmas Special) and Hell Bent (S9E12).
The Time of Angels/Flesh and Stone.
If you are refering to them turning into stone when you arent looking at them, they are quantum locked.
They have the perfect defence. They turn to stone when you look at them and no one can kill a stone. When you arn't looking at them they can move but no one can kill anything they aren't looking at.
no body knows but it might be explained ...one day
Well, in the first encounter with The Weeping Angels (Blink) The Doctor made them look at each other. In another story with them (The Time of Angels/Flesh and Stone) The Doctor made them all get sucked into the crack in time.
No. Weeping Angels are statues made from stone. Action figures are plastic. If action figures were an enemy in Doctor Who, they would be the Auton. Because the Auton are plastic people who are controlled by an entity called the Nestene Consciousness.
Blink (series 3 episode 10), The Time of Angels and Flesh and Stone (series 5 episodes 4 and 5).
They move like we do, just extremely quickly, crossing a fair amount of distance even in just the time it takes someone to blink. In 'Flesh and Stone', we see Weeping Angels actually moving for the first time, these ones are weakened through starvation and can't move as fast as normal, but they are shown turning their heads and moving their arms.
When a Weeping Angel is being observed, it can't move. It becomes 'quantum locked', it ceases to exist and becomes just a stone statue. If two Angels were to face each other, then there would be no way to break the lock on their own, they'd be there forever unless something else moved them apart.
Weeping angels are one of the oldest aliens in the universe. They have the perfect defense because they turn into stone or become "quantum locked" whenever any other living thing looks at them. As soon as you blink though, they travel towards you at almost the speed of light and send you back in time to a random point. They do this because they feed on the energy created.