What is something that only axolotls have?

Axolotls are unique for their ability to regenerate lost body parts, including limbs, spinal cord, heart, and even parts of their brain. This remarkable regenerative capability is largely due to their special cells called blastemal cells, which can transform into various types of tissues. Additionally, axolotls retain their larval features throughout their life, a condition known as neoteny, which is uncommon in amphibians. This combination of regeneration and neoteny sets axolotls apart from other species.