Minecraft wiki entry for Caves_%26_Cliffs, associated text: Based on the critically endangered Mexican salamander with the same name in real life.
Spawns in bodies of water within lush caves.
The first amphibian added to Minecraft.
Can be caught in a bucket like fish.
Comes in four common varieties, lucy (pink), wild (brown), gold, and cyan, and a rare blue variety, which has a 1⁄1200 (~0.08334%) chance of spawning. This fraction is based on the fact that there are about 1200 axolotls left in the wild.[11]
Has a 1/3 chance to play dead when damaged, receiving Regeneration I for 10 seconds, recovering 4.
This regeneration ability is likely based on how real axolotls can regrow lost limbs.
Preys on fish, glow squid and squid, and attacks drowned and guardians (doesn't include elder guardians) if tempted with tropical fish by a player, dealing 2.
Prioritizes hostile mobs over fish.