Who is the Peter Pan of the sea?

This is the Mexican Axolotl (Ambystoma mexicanum), a strange and curious frog in that never grows, it saves all your life, and the tadpole aspect if you lose, your tail grows rapidly and again. Why is considered "forever young" and receive the nickname "Peter Pan of the sea".

The fact that they do not try metamorphosis and not age is due to the fact that your pituitary gland does not release a hormone that activates the thyroid glands. Administering you thyroid hormones, thyroxine, scientists have managed to do with age, develop lungs and turns into an adult form that does not exist in nature.