AnimationClip and AnimationState

I have Animation class which contain 3 animation clips. So, GetClipCount() returns 3:

 Animation animation = subject.GetComponent<Animation>();
 animation.GetClipCount();

but when I try to enum AnimationState:

 foreach (AnimationState  clip in animation) {
     Debug.Log("Clip name is " + clip.name + ", length: " + clip.length + "sec");
 }

it enumerates only 2 AnimationStates. So, why it could happen and how can I create AnimationState for every my AnimationClip?

Thank You.