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             | net.minecraft.entity.EntityMinecartCommandBlock              |
| 41   | Boat                             | net.minecraft.entity.item.EntityBoat                         |
| 42   | MinecartRideable                 | net.minecraft.entity.item.EntityMinecartEmpty                |
| 43   | MinecartChest                    | net.minecraft.entity.item.EntityMinecartChest                |
| 44   | MinecartFurnace                  | net.minecraft.entity.item.EntityMinecartFurnace              |
| 45   | MinecartTNT                      | net.minecraft.entity.item.EntityMinecartTNT                  |
| 301  | BiomesOPlenty.JungleSpider       | biomesoplenty.common.entities.EntityJungleSpider             |
| 46   | MinecartHopper                   | net.minecraft.entity.item.EntityMinecartHopper               |
| 302  | BiomesOPlenty.Rosester           | biomesoplenty.common.entities.EntityRosester                 |
| 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                 |
| ???  | TConstruct.Crystal               | tconstruct.world.entity.Crystal                              |
| ???  | Natura.NitroCreeper              | mods.natura.entity.NitroCreeper                              |
| ???  | Forestry.cart.beehouse           | forestry.apiculture.entities.EntityMinecartBeehouse          |
| ???  | cfm.MountableBlock               | com.mrcrayfish.furniture.entity.EntitySittableBlock          |
| ???  | TConstruct.Fancy Item            | tconstruct.tools.entity.FancyEntityItem                      |
| ???  | Forestry.cart.apiary             | forestry.apiculture.entities.EntityMinecartApiary            |
| ???  | chisel.CloudInABottle            | com.cricketcraft.chisel.entity.EntityCloudInABottle          |
| ???  | MoCreatures.LitterBox            | drzhark.mocreatures.entity.item.MoCEntityLitterBox           |
| ???  | adventurebackpack.rideableSpider | com.darkona.adventurebackpack.entity.EntityFriendlySpider    |
| ???  | BiblioCraft.SeatEntity           | jds.bibliocraft.entity.EntitySeat                            |
| ???  | MoCreatures.FishBowl             | drzhark.mocreatures.entity.item.MoCEntityFishBowl            |
| ???  | chisel.snowman                   | com.cricketcraft.chisel.entity.EntityChiselSnowman           |
| ???  | NetherOres.ArmedOre              | powercrystals.netherores.entity.EntityArmedOre               |
| ???  | MoCreatures.PetScorpion          | drzhark.mocreatures.entity.passive.MoCEntityPetScorpion      |
| ???  | TConstruct.Shuriken              | tconstruct.weaponry.entity.ShurikenEntity                    |
| ???  | BiomesOPlenty.dart               | biomesoplenty.common.entities.projectiles.EntityDart         |
| ???  | Natura.Imp                       | mods.natura.entity.ImpEntity                                 |
| ???  | Natura.FlameSpider               | mods.natura.entity.HeatscarSpider                            |
| ???  | adventurebackpack.inflatableBoat | com.darkona.adventurebackpack.entity.EntityInflatableBoat    |
| ???  | CarpentersBlocks.CarpentersTile  | com.carpentersblocks.entity.item.EntityCarpentersTile        |
| ???  | MoCreatures.MoCPlatform          | drzhark.mocreatures.entity.item.MoCEntityPlatform            |
| ???  | TConstruct.Javelin               | tconstruct.weaponry.entity.JavelinEntity                     |
| ???  | TConstruct.Dagger                | tconstruct.tools.entity.DaggerEntity                         |
| ???  | TConstruct.ThrowingKnife         | tconstruct.weaponry.entity.ThrowingKnifeEntity               |
| ???  | emeraldobsidianmod.ObsidianArrow | com.royalsmods.emeraldobsidianmod.entity.EntityObsidianArrow |
| ???  | MoCreatures.Egg                  | drzhark.mocreatures.entity.item.MoCEntityEgg                 |
| ???  | TConstruct.Arrow                 | tconstruct.weaponry.entity.ArrowEntity                       |
| ???  | MoCreatures.KittyBed             | drzhark.mocreatures.entity.item.MoCEntityKittyBed            |
| ???  | TConstruct.Launched Potion       | tconstruct.tools.entity.LaunchedPotion                       |
| ???  | TConstruct.Bolt                  | tconstruct.weaponry.entity.BoltEntity                        |
| ???  | 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       |
| ???  | Forestry.butterflyGE             | forestry.lepidopterology.entities.EntityButterfly            |
| ???  | TConstruct.KingSlime             | tconstruct.world.entity.KingBlueSlime                        |
| ???  | Natura.FusewoodArrow             | mods.natura.entity.FusewoodArrow                             |
| ???  | Natura.FlameSpiderBaby           | mods.natura.entity.BabyHeatscarSpider                        |
| ???  | NetherOres.netherOresHellfish    | powercrystals.netherores.entity.EntityHellfish               |
| ???  | chisel.BallOMoss                 | com.cricketcraft.chisel.entity.EntityBallOMoss               |
