Minecraft wiki entry for Axolotl, associated text: Multiple axolotls in a lush cave.
An axolotl army attacking an Elder Guardian. Note the outdated texture.
Ditto
Axolotl variants from development, including unreleased green one.
The pose of the no-pose in development.
An axolotl playing dead in development.
Buckets of axolotl and powder snow in item frames.
A screenshot showcasing the addition of axolotls in 20w51a. A Sculk Sensor can also be seen.