Although many animation, deformation and metamorphosis techniques have been proposed, the simultaneous combination of those three transformations has never been addressed for three dimensional objects so far. This paper presents a framework for controlling metamorphosis between two animated implicit models built from skeletal elements. It relies on the animated BlobTree model that encompasses the animation and metamorphosis in an unified and coherent fashion. Our method is general and supports a wide range of animation systems such as key-frames or physically based systems.