Axolotls drink from the Fountain of Youth!
It takes about 2 weeks for their eggs to hatch and a tiny tadpole to emerge. It’s just 1 cm long and uses six feathery gills and a dorsal fin to aid in their aquatic lifestyle.
Over the next year or two they acquire four spindly legs and reach a length of about a foot.
But they never lose those feathery gills and that dorsal fin. While their relatives metamorphose into an adult, terrestrial salamander with sufficiently thick skin and strong legs to survive on land, Axolotls stay in their lakes forever more and simply become bigger and bigger babies.