Lizards lose their tails for several reasons: Defense mechanism: To escape predators, lizards can shed and regenerate their tails. Energy conservation: Detaching the tail allows them to lose fat and nutrients stored in the tail, but growing it back requires significant energy. Fracture planes: Lizards have weak spots along their tail where it can detach. Territorial disputes: Bullying by other lizards in the same terrarium can lead to tail loss. Improper conditions: Stress due to poor terrarium conditions or infections can also cause tail loss.