The animal that can regenerate it's heart is the starfish as well as Zebrafish, Arthropod, Sea cucumbers, Flatworms and Sponge,
The animal that can regrow it's head is the Marshalling stem cells also known as the Hydractinia.
The key to Hydractinia's regenerative talent and the ability to regrow it's head is the fact that it retains its embryonic stem cells for life.
Each no bigger than a baby's eyelash, they are called Hydractinia, and up close resemble a tree, each with a foot, a trunk and a tentacled head used for catching tasty passing detritus.
The animal that grows it's tail back is the Salamander.
The salamander which is amphibious can regrow it's lost tail to full length when it loses it's tail.
The process of the salamander growing it's tail back sees cells migrating to the wound and then it slowly regenerates the salamanders tail back within a couple of weeks.
Salamanders are a group of amphibians that have tails as adults.
The group of amphibians that have tails as adults includes amphibians commonly known as newts and sirens.
Most salamanders look like a cross between a lizard and a frog.
They have moist, smooth skin like frogs and long tails like lizards.
All salamanders are poisonous.
If you were to accidentally ingest their toxins, it can make you very sick.
California newts are quite poisonous because their skin secretes tetrodotoxin, the same toxin found in puffer fish, making them deadly to animals that eat them.
Salamanders play a fundamental role in the good functioning of ecosystems.
As they are very sensitive to environmental change and pollution, salamanders, and their habitat, need to be protected for the species and their ecosystem to survive.