Axolotls are dark-colored and can shift their hue a few shades lighter or darker as needed for camouflage! Pink and light-colored axolotls are bred by humans as pets for their “pleasing” shades.
They are also used in laboratories to study another superpower: regenerating their limbs, lungs, heart, jaws, spines, and even parts of their brain! Scientists have found that axolotls can regrow a new limb five times perfectly, in a few weeks—without even a scar. Every tissue is replaced: skin, bone, cartilage, muscle, and stem cells. Other organs can regenerate countless times and be completely functional. Naturally, scientists would like to harness that ability and apply it to human medicine.