The hopes for animal life – still unknown- are historically manifested throughout an unexplored geography, feeding frequently on the record of multiple species and new subspecies found each year. These aspects, together with advances in genetic engineering, studies on mutations, as well as the current interest in teratology, encourage debate regarding the existence of true hybrids or natural monsters. Cellular chimerism raises a debate that first of all talks about the limits of the imagination in the forms of the natural world.