diff --git a/AnimalZoo/src/App.java b/AnimalZoo/src/App.java
index 0a839f9..1b6dc8b 100644
--- a/AnimalZoo/src/App.java
+++ b/AnimalZoo/src/App.java
@@ -1,5 +1,5 @@
 public class App {
     public static void main(String[] args) throws Exception {
-        System.out.println("Hello, World!");
+        //System.out.println("Hello, World!");
     }
 }
diff --git a/AnimalZoo/src/Trainable.java b/AnimalZoo/src/Trainable.java
new file mode 100644
index 0000000..4a3de0e
--- /dev/null
+++ b/AnimalZoo/src/Trainable.java
@@ -0,0 +1,3 @@
+public interface Trainable {
+    public void performTrick();
+}