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The Axolotl (Ambystoma mexicanum), also known as the “Mexican salamander,” is a superhero of regeneration. Axolotls can functionally regenerate multiple body parts—including limbs, spinal cord, and parts of the brain and heart—without forming scar tissue. They are native to only one lake (Lake Xochimilco) in Mexico.

Axolotls are unusual among amphibians in that they reach adulthood without going through metamorphosis. When the axolotl genome was it was the largest genome ever fully sequenced! (Scientists have since discovered two larger genomes). Axolotls have 32 billion base pairs compared to about 3 billion in humans.