The axolotl is a species of Mexican mole salamander. It is a weird, funny little animal, which remained gilled and aquatic, because its larvae fail to undergo metamorphosis.
They have a curious ability to regenerate themselves and hence they are often used in research. It can regrow the same limb up to 5 times. Then it stops.
The feathery looking branches that extend from either side of it’s head are its gills.
The Axolotl is also over 1,000 times more resistant to cancer than mammals.