This is a list of all the entities you can use in the json file.
| IDs  | name                                      | Class                                                                    |
+------+-------------------------------------------+--------------------------------------------------------------------------+
| 1    | Item                                      | net.minecraft.entity.item.EntityItem                                     |
| 2    | XPOrb                                     | net.minecraft.entity.item.EntityXPOrb                                    |
| 8    | LeashKnot                                 | net.minecraft.entity.EntityLeashKnot                                     |
| 9    | Painting                                  | net.minecraft.entity.item.EntityPainting                                 |
| 10   | Arrow                                     | net.minecraft.entity.projectile.EntityArrow                              |
| 11   | Snowball                                  | net.minecraft.entity.projectile.EntitySnowball                           |
| 12   | Fireball                                  | net.minecraft.entity.projectile.EntityLargeFireball                      |
| 13   | SmallFireball                             | net.minecraft.entity.projectile.EntitySmallFireball                      |
| 14   | ThrownEnderpearl                          | net.minecraft.entity.item.EntityEnderPearl                               |
| 15   | EyeOfEnderSignal                          | net.minecraft.entity.item.EntityEnderEye                                 |
| 16   | ThrownPotion                              | net.minecraft.entity.projectile.EntityPotion                             |
| 17   | ThrownExpBottle                           | net.minecraft.entity.item.EntityExpBottle                                |
| 18   | ItemFrame                                 | net.minecraft.entity.item.EntityItemFrame                                |
| 19   | WitherSkull                               | net.minecraft.entity.projectile.EntityWitherSkull                        |
| 20   | PrimedTnt                                 | net.minecraft.entity.item.EntityTNTPrimed                                |
| 21   | FallingSand                               | net.minecraft.entity.item.EntityFallingBlock                             |
| 22   | FireworksRocketEntity                     | net.minecraft.entity.item.EntityFireworkRocket                           |
| 40   | MinecartCommandBlock                      | mods.railcraft.common.carts.EntityCartCommand                            |
| 41   | Boat                                      | net.minecraft.entity.item.EntityBoat                                     |
| 42   | MinecartRideable                          | mods.railcraft.common.carts.EntityCartBasic                              |
| 43   | MinecartChest                             | mods.railcraft.common.carts.EntityCartChest                              |
| 44   | MinecartFurnace                           | mods.railcraft.common.carts.EntityCartFurnace                            |
| 301  | BiomesOPlenty.JungleSpider                | biomesoplenty.common.entities.EntityJungleSpider                         |
| 45   | MinecartTNT                               | mods.railcraft.common.carts.EntityCartTNT                                |
| 302  | BiomesOPlenty.Rosester                    | biomesoplenty.common.entities.EntityRosester                             |
| 46   | MinecartHopper                            | net.minecraft.entity.item.EntityMinecartHopper                           |
| 47   | MinecartSpawner                           | net.minecraft.entity.ai.EntityMinecartMobSpawner                         |
| 303  | BiomesOPlenty.Glob                        | biomesoplenty.common.entities.EntityGlob                                 |
| 48   | Mob                                       | net.minecraft.entity.EntityLiving                                        |
| 304  | BiomesOPlenty.Phantom                     | biomesoplenty.common.entities.EntityPhantom                              |
| 49   | Monster                                   | net.minecraft.entity.monster.EntityMob                                   |
| 305  | BiomesOPlenty.Wasp                        | biomesoplenty.common.entities.EntityWasp                                 |
| 50   | Creeper                                   | net.minecraft.entity.monster.EntityCreeper                               |
| 306  | BiomesOPlenty.Bird                        | biomesoplenty.common.entities.EntityBird                                 |
| 51   | Skeleton                                  | net.minecraft.entity.monster.EntitySkeleton                              |
| 307  | BiomesOPlenty.Pixie                       | biomesoplenty.common.entities.EntityPixie                                |
| 52   | Spider                                    | net.minecraft.entity.monster.EntitySpider                                |
| 53   | Giant                                     | net.minecraft.entity.monster.EntityGiantZombie                           |
| 54   | Zombie                                    | net.minecraft.entity.monster.EntityZombie                                |
| 55   | Slime                                     | net.minecraft.entity.monster.EntitySlime                                 |
| 56   | Ghast                                     | net.minecraft.entity.monster.EntityGhast                                 |
| 57   | PigZombie                                 | net.minecraft.entity.monster.EntityPigZombie                             |
| 58   | Enderman                                  | net.minecraft.entity.monster.EntityEnderman                              |
| 59   | CaveSpider                                | net.minecraft.entity.monster.EntityCaveSpider                            |
| 60   | Silverfish                                | net.minecraft.entity.monster.EntitySilverfish                            |
| 61   | Blaze                                     | net.minecraft.entity.monster.EntityBlaze                                 |
| 62   | LavaSlime                                 | net.minecraft.entity.monster.EntityMagmaCube                             |
| 63   | EnderDragon                               | net.minecraft.entity.boss.EntityDragon                                   |
| 64   | WitherBoss                                | net.minecraft.entity.boss.EntityWither                                   |
| 65   | Bat                                       | net.minecraft.entity.passive.EntityBat                                   |
| 66   | Witch                                     | net.minecraft.entity.monster.EntityWitch                                 |
| 7256 | MoCreatures.Bunny                         | drzhark.mocreatures.entity.passive.MoCEntityBunny                        |
| 7257 | MoCreatures.Snake                         | drzhark.mocreatures.entity.passive.MoCEntitySnake                        |
| 90   | Pig                                       | net.minecraft.entity.passive.EntityPig                                   |
| 7258 | MoCreatures.Turtle                        | drzhark.mocreatures.entity.passive.MoCEntityTurtle                       |
| 91   | Sheep                                     | net.minecraft.entity.passive.EntitySheep                                 |
| 7259 | MoCreatures.Bird                          | drzhark.mocreatures.entity.passive.MoCEntityBird                         |
| 92   | Cow                                       | net.minecraft.entity.passive.EntityCow                                   |
| 7260 | MoCreatures.Mouse                         | drzhark.mocreatures.entity.passive.MoCEntityMouse                        |
| 93   | Chicken                                   | net.minecraft.entity.passive.EntityChicken                               |
| 7261 | MoCreatures.Turkey                        | drzhark.mocreatures.entity.passive.MoCEntityTurkey                       |
| 94   | Squid                                     | net.minecraft.entity.passive.EntitySquid                                 |
| 7262 | MoCreatures.WildHorse                     | drzhark.mocreatures.entity.passive.MoCEntityHorse                        |
| 95   | Wolf                                      | net.minecraft.entity.passive.EntityWolf                                  |
| 7263 | MoCreatures.HorseMob                      | drzhark.mocreatures.entity.monster.MoCEntityHorseMob                     |
| 96   | MushroomCow                               | net.minecraft.entity.passive.EntityMooshroom                             |
| 7264 | MoCreatures.Ogre                          | drzhark.mocreatures.entity.monster.MoCEntityOgre                         |
| 97   | SnowMan                                   | net.minecraft.entity.monster.EntitySnowman                               |
| 7265 | MoCreatures.Boar                          | drzhark.mocreatures.entity.passive.MoCEntityBoar                         |
| 98   | Ozelot                                    | net.minecraft.entity.passive.EntityOcelot                                |
| 7266 | MoCreatures.Bear                          | drzhark.mocreatures.entity.passive.MoCEntityBear                         |
| 99   | VillagerGolem                             | net.minecraft.entity.monster.EntityIronGolem                             |
| 7267 | MoCreatures.Duck                          | drzhark.mocreatures.entity.passive.MoCEntityDuck                         |
| 100  | EntityHorse                               | net.minecraft.entity.passive.EntityHorse                                 |
| 7268 | MoCreatures.BigCat                        | drzhark.mocreatures.entity.passive.MoCEntityBigCat                       |
| 7269 | MoCreatures.Deer                          | drzhark.mocreatures.entity.passive.MoCEntityDeer                         |
| 7270 | MoCreatures.WWolf                         | drzhark.mocreatures.entity.monster.MoCEntityWWolf                        |
| 7271 | MoCreatures.Wraith                        | drzhark.mocreatures.entity.monster.MoCEntityWraith                       |
| 7272 | MoCreatures.FlameWraith                   | drzhark.mocreatures.entity.monster.MoCEntityFlameWraith                  |
| 7273 | MoCreatures.Fox                           | drzhark.mocreatures.entity.passive.MoCEntityFox                          |
| 7274 | MoCreatures.Werewolf                      | drzhark.mocreatures.entity.monster.MoCEntityWerewolf                     |
| 7275 | MoCreatures.Shark                         | drzhark.mocreatures.entity.aquatic.MoCEntityShark                        |
| 7276 | MoCreatures.Dolphin                       | drzhark.mocreatures.entity.aquatic.MoCEntityDolphin                      |
| 7277 | MoCreatures.Fishy                         | drzhark.mocreatures.entity.aquatic.MoCEntityFishy                        |
| 7278 | MoCreatures.Kitty                         | drzhark.mocreatures.entity.passive.MoCEntityKitty                        |
| 7281 | MoCreatures.Rat                           | drzhark.mocreatures.entity.monster.MoCEntityRat                          |
| 7282 | MoCreatures.HellRat                       | drzhark.mocreatures.entity.monster.MoCEntityHellRat                      |
| 7283 | MoCreatures.Scorpion                      | drzhark.mocreatures.entity.monster.MoCEntityScorpion                     |
| 7284 | MoCreatures.Crocodile                     | drzhark.mocreatures.entity.passive.MoCEntityCrocodile                    |
| 7285 | MoCreatures.Ray                           | drzhark.mocreatures.entity.aquatic.MoCEntityRay                          |
| 7286 | MoCreatures.JellyFish                     | drzhark.mocreatures.entity.aquatic.MoCEntityJellyFish                    |
| 7287 | MoCreatures.Goat                          | drzhark.mocreatures.entity.passive.MoCEntityGoat                         |
| 120  | Villager                                  | net.minecraft.entity.passive.EntityVillager                              |
| 7290 | MoCreatures.Ostrich                       | drzhark.mocreatures.entity.passive.MoCEntityOstrich                      |
| 7291 | MoCreatures.Bee                           | drzhark.mocreatures.entity.ambient.MoCEntityBee                          |
| 7292 | MoCreatures.Fly                           | drzhark.mocreatures.entity.ambient.MoCEntityFly                          |
| 7293 | MoCreatures.DragonFly                     | drzhark.mocreatures.entity.ambient.MoCEntityDragonfly                    |
| 7294 | MoCreatures.Firefly                       | drzhark.mocreatures.entity.ambient.MoCEntityFirefly                      |
| 7295 | MoCreatures.Cricket                       | drzhark.mocreatures.entity.ambient.MoCEntityCricket                      |
| 7296 | MoCreatures.Snail                         | drzhark.mocreatures.entity.ambient.MoCEntitySnail                        |
| 7297 | MoCreatures.ButterFly                     | drzhark.mocreatures.entity.ambient.MoCEntityButterfly                    |
| 7299 | MoCreatures.BigGolem                      | drzhark.mocreatures.entity.monster.MoCEntityGolem                        |
| 7302 | MoCreatures.Elephant                      | drzhark.mocreatures.entity.passive.MoCEntityElephant                     |
| 7303 | MoCreatures.KomodoDragon                  | drzhark.mocreatures.entity.passive.MoCEntityKomodo                       |
| 7304 | MoCreatures.Wyvern                        | drzhark.mocreatures.entity.passive.MoCEntityWyvern                       |
| 7305 | MoCreatures.Roach                         | drzhark.mocreatures.entity.ambient.MoCEntityRoach                        |
| 7306 | MoCreatures.Maggot                        | drzhark.mocreatures.entity.ambient.MoCEntityMaggot                       |
| 7307 | MoCreatures.Crab                          | drzhark.mocreatures.entity.ambient.MoCEntityCrab                         |
| 7308 | MoCreatures.Raccoon                       | drzhark.mocreatures.entity.passive.MoCEntityRaccoon                      |
| 7309 | MoCreatures.MiniGolem                     | drzhark.mocreatures.entity.monster.MoCEntityMiniGolem                    |
| 7310 | MoCreatures.SilverSkeleton                | drzhark.mocreatures.entity.monster.MoCEntitySilverSkeleton               |
| 7311 | MoCreatures.Ant                           | drzhark.mocreatures.entity.ambient.MoCEntityAnt                          |
| 7312 | MoCreatures.MediumFish                    | drzhark.mocreatures.entity.aquatic.MoCEntityMediumFish                   |
| 7313 | MoCreatures.SmallFish                     | drzhark.mocreatures.entity.aquatic.MoCEntitySmallFish                    |
| 7314 | MoCreatures.Piranha                       | drzhark.mocreatures.entity.aquatic.MoCEntityPiranha                      |
| 7315 | MoCreatures.Ent                           | drzhark.mocreatures.entity.passive.MoCEntityEnt                          |
| 7316 | MoCreatures.Mole                          | drzhark.mocreatures.entity.passive.MoCEntityMole                         |
| 200  | EnderCrystal                              | net.minecraft.entity.item.EntityEnderCrystal                             |
| ???  | ImmersiveEngineering.railgunShot          | blusunrize.immersiveengineering.common.entities.EntityRailgunShot        |
| ???  | TConstruct.Crystal                        | tconstruct.world.entity.Crystal                                          |
| ???  | ImmersiveEngineering.revolverShot         | blusunrize.immersiveengineering.common.entities.EntityRevolvershot       |
| ???  | Railcraft.railcraft.cart.loco.steam       | mods.railcraft.common.carts.EntityLocomotiveSteamSolid                   |
| ???  | Railcraft.cart.gift                       | mods.railcraft.common.carts.EntityCartGift                               |
| ???  | Railcraft.railcraft.cart.gift             | mods.railcraft.common.carts.EntityCartGift                               |
| ???  | Railcraft.railcraft.cart.bore             | mods.railcraft.common.carts.EntityTunnelBore                             |
| ???  | Railcraft.cart.pumpkin                    | mods.railcraft.common.carts.EntityCartPumpkin                            |
| ???  | Railcraft.cart.work                       | mods.railcraft.common.carts.EntityCartWork                               |
| ???  | Railcraft.railcraft.cart.command.block    | mods.railcraft.common.carts.EntityCartCommand                            |
| ???  | ImmersiveEngineering.revolverShotHoming   | blusunrize.immersiveengineering.common.entities.EntityRevolvershotHoming |
| ???  | Railcraft.cart.cargo                      | mods.railcraft.common.carts.EntityCartCargo                              |
| ???  | Railcraft.railcraft.cart.tank             | mods.railcraft.common.carts.EntityCartTank                               |
| ???  | adventurebackpack.rideableSpider          | com.darkona.adventurebackpack.entity.EntityFriendlySpider                |
| ???  | Railcraft.cart.tank                       | mods.railcraft.common.carts.EntityCartTank                               |
| ???  | Railcraft.railcraft.cart.anchor.admin     | mods.railcraft.common.carts.EntityCartAnchorAdmin                        |
| ???  | MoCreatures.FishBowl                      | drzhark.mocreatures.entity.item.MoCEntityFishBowl                        |
| ???  | Railcraft.cart.command.block              | mods.railcraft.common.carts.EntityCartCommand                            |
| ???  | chisel.snowman                            | com.cricketcraft.chisel.entity.EntityChiselSnowman                       |
| ???  | MoCreatures.PetScorpion                   | drzhark.mocreatures.entity.passive.MoCEntityPetScorpion                  |
| ???  | Railcraft.railcraft.cart.cargo            | mods.railcraft.common.carts.EntityCartCargo                              |
| ???  | Railcraft.railcraft.cart.work             | mods.railcraft.common.carts.EntityCartWork                               |
| ???  | Natura.FlameSpider                        | mods.natura.entity.HeatscarSpider                                        |
| ???  | CarpentersBlocks.CarpentersTile           | com.carpentersblocks.entity.item.EntityCarpentersTile                    |
| ???  | Railcraft.cart.tnt.wood                   | mods.railcraft.common.carts.EntityCartTNTWood                            |
| ???  | MoCreatures.MoCPlatform                   | drzhark.mocreatures.entity.item.MoCEntityPlatform                        |
| ???  | TConstruct.Javelin                        | tconstruct.weaponry.entity.JavelinEntity                                 |
| ???  | Railcraft.cart.track.remover              | mods.railcraft.common.carts.EntityCartTrackRemover                       |
| ???  | TConstruct.Dagger                         | tconstruct.tools.entity.DaggerEntity                                     |
| ???  | Railcraft.railcraft.cart.furnace          | mods.railcraft.common.carts.EntityCartFurnace                            |
| ???  | Railcraft.cart.anchor.admin               | mods.railcraft.common.carts.EntityCartAnchorAdmin                        |
| ???  | Railcraft.railcraft.cart.chest            | mods.railcraft.common.carts.EntityCartChest                              |
| ???  | Railcraft.railcraft.cart.loco.steam.solid | mods.railcraft.common.carts.EntityLocomotiveSteamSolid                   |
| ???  | TConstruct.Arrow                          | tconstruct.weaponry.entity.ArrowEntity                                   |
| ???  | MoCreatures.KittyBed                      | drzhark.mocreatures.entity.item.MoCEntityKittyBed                        |
| ???  | TConstruct.Launched Potion                | tconstruct.tools.entity.LaunchedPotion                                   |
| ???  | Natura.FusewoodArrow                      | mods.natura.entity.FusewoodArrow                                         |
| ???  | ImmersiveEngineering.revolverShotWolfpack | blusunrize.immersiveengineering.common.entities.EntityWolfpackShot       |
| ???  | Railcraft.cart.furnace                    | mods.railcraft.common.carts.EntityCartFurnace                            |
| ???  | NetherOres.netherOresHellfish             | powercrystals.netherores.entity.EntityHellfish                           |
| ???  | Railcraft.railcraft.cart.track.relayer    | mods.railcraft.common.carts.EntityCartTrackRelayer                       |
| ???  | chisel.BallOMoss                          | com.cricketcraft.chisel.entity.EntityBallOMoss                           |
| ???  | ImmersiveEngineering.skylineCrate         | blusunrize.immersiveengineering.common.entities.EntitySkycrate           |
| ???  | Railcraft.cart.loco.steam.solid           | mods.railcraft.common.carts.EntityLocomotiveSteamSolid                   |
| ???  | Natura.NitroCreeper                       | mods.natura.entity.NitroCreeper                                          |
| ???  | Railcraft.railcraft.cart.tnt.wood         | mods.railcraft.common.carts.EntityCartTNTWood                            |
| ???  | Railcraft.cart.chest                      | mods.railcraft.common.carts.EntityCartChest                              |
| ???  | Railcraft.cart.anchor                     | mods.railcraft.common.carts.EntityCartAnchor                             |
| ???  | Forestry.cart.beehouse                    | forestry.apiculture.entities.EntityMinecartBeehouse                      |
| ???  | cfm.MountableBlock                        | com.mrcrayfish.furniture.entity.EntitySittableBlock                      |
| ???  | TConstruct.Fancy Item                     | tconstruct.tools.entity.FancyEntityItem                                  |
| ???  | Railcraft.ItemFireproof                   | mods.railcraft.common.items.EntityItemFireproof                          |
| ???  | Forestry.cart.apiary                      | forestry.apiculture.entities.EntityMinecartApiary                        |
| ???  | Railcraft.cart.tnt                        | mods.railcraft.common.carts.EntityCartTNT                                |
| ???  | chisel.CloudInABottle                     | com.cricketcraft.chisel.entity.EntityCloudInABottle                      |
| ???  | Railcraft.cart.track.relayer              | mods.railcraft.common.carts.EntityCartTrackRelayer                       |
| ???  | MoCreatures.LitterBox                     | drzhark.mocreatures.entity.item.MoCEntityLitterBox                       |
| ???  | Railcraft.railcraft.cart.anchor           | mods.railcraft.common.carts.EntityCartAnchor                             |
| ???  | Railcraft.railcraft.cart.tnt              | mods.railcraft.common.carts.EntityCartTNT                                |
| ???  | BiblioCraft.SeatEntity                    | jds.bibliocraft.entity.EntitySeat                                        |
| ???  | Railcraft.cart.undercutter                | mods.railcraft.common.carts.EntityCartUndercutter                        |
| ???  | NetherOres.ArmedOre                       | powercrystals.netherores.entity.EntityArmedOre                           |
| ???  | Railcraft.railcraft.cart.anchor.personal  | mods.railcraft.common.carts.EntityCartAnchorPersonal                     |
| ???  | Railcraft.cart.anchor.personal            | mods.railcraft.common.carts.EntityCartAnchorPersonal                     |
| ???  | Railcraft.railcraft.cart.track.remover    | mods.railcraft.common.carts.EntityCartTrackRemover                       |
| ???  | TConstruct.Shuriken                       | tconstruct.weaponry.entity.ShurikenEntity                                |
| ???  | BiomesOPlenty.dart                        | biomesoplenty.common.entities.projectiles.EntityDart                     |
| ???  | Natura.Imp                                | mods.natura.entity.ImpEntity                                             |
| ???  | adventurebackpack.inflatableBoat          | com.darkona.adventurebackpack.entity.EntityInflatableBoat                |
| ???  | Railcraft.cart.track.layer                | mods.railcraft.common.carts.EntityCartTrackLayer                         |
| ???  | ImmersiveEngineering.skylineHook          | blusunrize.immersiveengineering.common.entities.EntitySkylineHook        |
| ???  | TConstruct.ThrowingKnife                  | tconstruct.weaponry.entity.ThrowingKnifeEntity                           |
| ???  | emeraldobsidianmod.ObsidianArrow          | com.royalsmods.emeraldobsidianmod.entity.EntityObsidianArrow             |
| ???  | Railcraft.ItemFirestone                   | mods.railcraft.common.items.firestone.EntityItemFirestone                |
| ???  | MoCreatures.Egg                           | drzhark.mocreatures.entity.item.MoCEntityEgg                             |
| ???  | Railcraft.cart.loco.electric              | mods.railcraft.common.carts.EntityLocomotiveElectric                     |
| ???  | Railcraft.railcraft.cart.basic            | mods.railcraft.common.carts.EntityCartBasic                              |
| ???  | Railcraft.railcraft.cart.loco.electric    | mods.railcraft.common.carts.EntityLocomotiveElectric                     |
| ???  | TConstruct.Bolt                           | tconstruct.weaponry.entity.BoltEntity                                    |
| ???  | Railcraft.railcraft.cart.hopper           | net.minecraft.entity.item.EntityMinecartHopper                           |
| ???  | TConstruct.EdibleSlime                    | tconstruct.world.entity.BlueSlime                                        |
| ???  | BiomesOPlenty.mudball                     | biomesoplenty.common.entities.projectiles.EntityMudball                  |
| ???  | chisel.SmashingRock                       | com.cricketcraft.chisel.entity.EntitySmashingRock                        |
| ???  | MoCreatures.TRock                         | drzhark.mocreatures.entity.item.MoCEntityThrowableRock                   |
| ???  | Railcraft.railcraft.cart.track.layer      | mods.railcraft.common.carts.EntityCartTrackLayer                         |
| ???  | Forestry.butterflyGE                      | forestry.lepidopterology.entities.EntityButterfly                        |
| ???  | Railcraft.cart.bore                       | mods.railcraft.common.carts.EntityTunnelBore                             |
| ???  | TConstruct.KingSlime                      | tconstruct.world.entity.KingBlueSlime                                    |
| ???  | Natura.FlameSpiderBaby                    | mods.natura.entity.BabyHeatscarSpider                                    |
| ???  | Railcraft.cart.basic                      | mods.railcraft.common.carts.EntityCartBasic                              |
| ???  | ImmersiveEngineering.chemthrowerShot      | blusunrize.immersiveengineering.common.entities.EntityChemthrowerShot    |
| ???  | Railcraft.railcraft.cart.pumpkin          | mods.railcraft.common.carts.EntityCartPumpkin                            |
| ???  | Railcraft.railcraft.cart.undercutter      | mods.railcraft.common.carts.EntityCartUndercutter                        |
