--- ../work/decompile-8eb82bde//net/minecraft/server/BlockMonsterEggs.java	2014-11-28 17:43:42.921707439 +0000
+++ src/main/java/net/minecraft/server/BlockMonsterEggs.java	2014-11-28 17:38:20.000000000 +0000
@@ -2,6 +2,8 @@
 
 import java.util.Random;
 
+import org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason; // CraftBukkit
+
 public class BlockMonsterEggs extends Block {
 
     public static final BlockStateEnum VARIANT = BlockStateEnum.of("variant", EnumMonsterEggVarient.class);
@@ -50,7 +52,7 @@
             EntitySilverfish entitysilverfish = new EntitySilverfish(world);
 
             entitysilverfish.setPositionRotation((double) blockposition.getX() + 0.5D, (double) blockposition.getY(), (double) blockposition.getZ() + 0.5D, 0.0F, 0.0F);
-            world.addEntity(entitysilverfish);
+            world.addEntity(entitysilverfish, SpawnReason.SILVERFISH_BLOCK); // CraftBukkit - add SpawnReason
             entitysilverfish.y();
         }