Spawn Reasons

Reason	Description
`NATURAL`	When something spawns from natural means.
`JOCKEY`	When an entity spawns as a jockey of another entity (mostly spider jockeys).
`CHUNK_GEN`	When a creature spawns due to chunk generation.
`SPAWNER`	When a creature spawns from a spawner.
`EGG`	When a creature spawns from an egg.
`SPAWNER_EGG`	When a creature spawns from a Spawner Egg.
`LIGHTNING`	When a creature spawns as a result of a lightning strike.
`BUILD_SNOWMAN`	When a snowman is spawned by being built.
`BUILD_IRONGOLEM`	When an iron golem is spawned by being built.
`BUILD_WITHER`	When a wither boss is spawned by being built.
`VILLAGE_DEFENSE`	When an iron golem is spawned to defend a village.
`VILLAGE_INVASION`	When a zombie is spawned to invade a village.
`BREEDING`	When an animal breeds to create a child.
`SLIME_SPLIT`	When a slime splits.
`REINFORCEMENTS`	When an entity calls for reinforcements.
`NETHER_PORTAL`	When a creature is spawned by a Nether portal.
`DISPENSE_EGG`	When a creature is spawned by a dispenser dispensing an egg.
`INFECTION`	When a zombie infects a villager.
`CURED`	When a villager is cured from infection.
`OCELOT_BABY`	When an ocelot has a baby spawned along with them.
`SILVERFISH_BLOCK`	When a silverfish spawns from an infested block.
`MOUNT`	When an entity spawns as a mount of another entity (mostly chicken jockeys).
`TRAP`	When an entity spawns as a trap for approaching player(s).
`CUSTOM`	When a creature is spawned by plugins.
`DEFAULT`	When an entity is missing a SpawnReason.