Can lizards regrow lost tails?

Yes, many lizards have the ability to regrow their tails. This process is often linked to autotomy, a defense mechanism where a lizard voluntarily sheds its tail when captured by a predator to facilitate an escape.123

While the tail can regenerate, the replacement is not a perfect copy of the original. Key differences include:4

• Internal Structure: Instead of replacing the original segmented vertebrae, the regenerated tail develops a long, tapering cartilaginous tube.14
• Nervous System: While the spinal cord is necessary for regeneration, the new tail does not reproduce the ganglia normally associated with the original spinal cord.14
• Appearance: The regenerated tail is often shorter than the original and may feature simpler scales, making it easily distinguishable from the original.24

This regenerative capability is an adaptive trait that allows the animal to recover from the loss of a body part, even if the new structure differs in detail from the one that was lost.43