diff --git a/src/main/java/com/songoda/ultimatestacker/entity/Check.java b/src/main/java/com/songoda/ultimatestacker/entity/Check.java
index 4b4a863..437742f 100644
--- a/src/main/java/com/songoda/ultimatestacker/entity/Check.java
+++ b/src/main/java/com/songoda/ultimatestacker/entity/Check.java
@@ -2,7 +2,7 @@ package com.songoda.ultimatestacker.entity;
 
 public enum Check {
 
-    SPAWN_REASON(false), // ToDo: This
+    SPAWN_REASON(false),
     NERFED(true),
     AGE(true),
     TICK_AGE(false),
diff --git a/src/main/java/com/songoda/ultimatestacker/listeners/EntityListeners.java b/src/main/java/com/songoda/ultimatestacker/listeners/EntityListeners.java
index 1791257..3fcf539 100644
--- a/src/main/java/com/songoda/ultimatestacker/listeners/EntityListeners.java
+++ b/src/main/java/com/songoda/ultimatestacker/listeners/EntityListeners.java
@@ -15,9 +15,12 @@ import org.bukkit.entity.*;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.EventPriority;
 import org.bukkit.event.Listener;
+import org.bukkit.event.entity.CreatureSpawnEvent;
 import org.bukkit.event.entity.EntityExplodeEvent;
+import org.bukkit.event.entity.EntitySpawnEvent;
 import org.bukkit.event.entity.ItemSpawnEvent;
 import org.bukkit.inventory.ItemStack;
+import org.bukkit.metadata.FixedMetadataValue;
 
 import java.util.ArrayList;
 import java.util.Iterator;
@@ -31,6 +34,11 @@ public class EntityListeners implements Listener {
         this.instance = instance;
     }
 
+    @EventHandler
+    public void onSpawn(CreatureSpawnEvent event) {
+        event.getEntity().setMetadata("US_REASON", new FixedMetadataValue(instance, event.getSpawnReason().name()));
+    }
+
     @EventHandler
     public void onEgg(ItemSpawnEvent event) {
         if (event.getEntity().getItemStack().getType() != Material.EGG) return;
diff --git a/src/main/java/com/songoda/ultimatestacker/utils/Methods.java b/src/main/java/com/songoda/ultimatestacker/utils/Methods.java
index e71bcfe..b8bc2d9 100644
--- a/src/main/java/com/songoda/ultimatestacker/utils/Methods.java
+++ b/src/main/java/com/songoda/ultimatestacker/utils/Methods.java
@@ -188,6 +188,10 @@ public class Methods {
         for (String checkStr : checks) {
             Check check = Check.valueOf(checkStr);
             switch (check) {
+                case SPAWN_REASON: {
+                    if (initalEntity.hasMetadata("US_REASON"))
+                        entityList.removeIf(entity -> entity.hasMetadata("US_REASON") && !entity.getMetadata("US_REASON").get(0).asString().equals("US_REASON"));
+                }
                 case AGE: {
                     if (!(initalEntity instanceof Ageable)) break;
 
diff --git a/src/main/java/com/songoda/ultimatestacker/utils/settings/Setting.java b/src/main/java/com/songoda/ultimatestacker/utils/settings/Setting.java
index ca23e79..479be92 100644
--- a/src/main/java/com/songoda/ultimatestacker/utils/settings/Setting.java
+++ b/src/main/java/com/songoda/ultimatestacker/utils/settings/Setting.java
@@ -61,7 +61,7 @@ public enum Setting {
             "These are checks that are processed before an entity is stacked.",
             "You can add and remove from the list at will.",
             "The acceptable check options are:",
-            "NERFED, AGE, TICK_AGE, PHANTOM_SIZE",
+            "SPAWN_REASON, NERFED, AGE, TICK_AGE, PHANTOM_SIZE",
             "CAN_BREED, IS_TAMED, ANIMAL_OWNER, SKELETON_TYPE",
             "ZOMBIE_BABY, SLIME_SIZE,  PIG_SADDLE, SHEEP_SHEERED",
             "SHEEP_COLOR, WOLF_COLLAR_COLOR, OCELOT_TYPE, HORSE_COLOR",