As a defense mechanism, lizards have the ability to self- amputate their tails to escape predators. When this loss occurs in the intervertebral fracture planes, where there is a cartilaginous disc that facilitates rupture, the amputated limb grows back, although with a different shape from the original.
Sometimes during regeneration there is a bifurcation of the cartilaginous cord ; This bifurcation, as it continues with the growth process, results in two tails appearing.
