Regeneration

Animals (and a few human tissues) that regrow lost body parts. Each topic lists only known properties from the cited papers.

• Axolotl limb regeneration
  2 studies · The Mexican axolotl salamander can regrow whole limbs.
• Deer antler regeneration
  3 studies · Deer regrow their antlers every year, among the fastest-growing tissues in mammals.
• Hydra (no aging)
  2 studies · A tiny freshwater polyp whose risk of dying does not rise with age.
• Liver and digit-tip regeneration in mammals
  2 studies · Mammals regrow little, but the liver restores lost mass, and in mice the digit tip can regrow if the nail area remains.
• Lizard tail regeneration
  1 study · Lizards drop their tails and grow new ones.
• Newt lens regeneration
  1 study · Newts can regrow the lens of the eye again and again.
• Planarian memory and bioelectric patterning
  3 studies · Planarian flatworms can regrow a whole body, including the brain, from a small piece, and their body plan is partly stored in electrical patterns.
• Sea cucumber gut regrowth
  1 study · Sea cucumbers can expel their internal organs and grow them back.
• Sea star arm regeneration
  2 studies · Sea stars can regrow lost arms.
• Spiny mouse skin regeneration
  1 study · African spiny mice shed skin to escape predators and regrow it, with hair follicles.
• Zebrafish fin and heart regeneration
  2 studies · Zebrafish regrow fins and even heart muscle.