thank you for your answer. The girafe turns its head from left to right and from right to left (it makes a rotation) to say no, no, no and lifts up its neck in the same time.
Best regards

In an animation, when I include the voice in the switch , all the 3 mouths are not animated , and why the voice is slower ?

In a girafe for example, the head and the neck are separated. How do i do to make lift up the neck and in the same time make move the head from left to right?