diff --git a/src/backend/Simulator.java b/src/backend/Simulator.java
index 010b67b..3742447 100644
--- a/src/backend/Simulator.java
+++ b/src/backend/Simulator.java
@@ -22,10 +22,10 @@ public class Simulator extends Thread {
 	private boolean stopFlag;
 	private boolean pauseFlag;
 	private boolean loopingBorder;
-	private int clickActionFlag;
+	private int clickActionFlag; // change from boolean to int 
 	private int loopDelay = 150;
 	
-	World currentWorld = new World(getWidth(),getHeight());
+	World currentWorld = new World(getWidth(),getHeight()); // create the instance of class World
 
 	//TODO : add missing attribute(s)
 
@@ -34,7 +34,7 @@ public class Simulator extends Thread {
 		stopFlag=false;
 		pauseFlag=false;
 		loopingBorder=false;
-		clickActionFlag=0;
+		clickActionFlag=0; //initallize the clickactionflag by 0
 
 		agents = new ArrayList<Agent>();
 		fieldBirthValues = new ArrayList<Integer>();
@@ -52,8 +52,8 @@ public class Simulator extends Thread {
 	}
 
 	public int getWidth() {
-		//TODO : replace with proper return
-		return COL_NUM;
+		//TODO replace with proper return
+		return COL_NUM; 
 	}
 
 	public int getHeight() {
@@ -190,6 +190,9 @@ public class Simulator extends Thread {
 		else if(clickActionFlag ==2) {
 			agents.add(new Sheep(x,y));
 		}
+		else if (clickActionFlag == 3) {
+			agents.add(new Wolf(x,y));
+		}
 	}
 	
 	/**
@@ -412,6 +415,9 @@ public class Simulator extends Thread {
 				agents.add(new Cow(agentValues[0],agentValues[1]));
 				
 			}
+			if(agentValues[2]==3) {
+				agents.add(new Wolf(agentValues[0],agentValues[1]));
+			}
 		}
 	}
 
@@ -423,14 +429,25 @@ public class Simulator extends Thread {
 		// TODO : initially return "sheep" or "cell"
 		// depending on clickActionFlag
 		if(clickActionFlag == 1) {
-			return "Cow";
+			return "cow";
 		}
 		else if (clickActionFlag == 0) {
 			return "cell";
 		}
+		else if(clickActionFlag == 2){
+			return "wolf";
+		}
 		else {
 			return "sheep";
 		}
 	}
+	public String typeAnimals(int x , int y,ArrayList<Agent> neighbor) {
+        Agent agent = neighbor.get(0);
+        if (agent instanceof Wolf) {
+            return "Wolf";
+        } else  {
+            return "Sheep";
+        } 
+    }
 
 }
diff --git a/src/backend/Wolf.java b/src/backend/Wolf.java
new file mode 100644
index 0000000..7ef89e4
--- /dev/null
+++ b/src/backend/Wolf.java
@@ -0,0 +1,67 @@
+package backend;
+
+import java.awt.Color;
+import java.util.ArrayList;
+import java.util.Random;
+
+public class Wolf extends Agent {
+
+	int hunger;
+	Random rand;
+
+	Wolf(int x,int y){
+		//first we call the constructor of the superClass(Animal)
+		//with the values we want.
+		// here we decide that a Sheep is initially white using this constructor
+		super(x,y,Color.red);
+		// we give our sheep a hunger value of zero at birth
+		hunger = 0;
+		//we initialize the random number generator we will use to move randomly
+		rand = new Random();
+	}
+
+	/**
+	 * action of the animal
+	 * it can interact with the cells or with other animals
+	 * as you wish
+	 */
+	public boolean liveTurn(ArrayList<Agent> neighbors, Simulator world) {
+		//ArrayList<Agent> nearby=world.getNeighboringAnimals(x,y,1); //look if the cell has an agent
+		if (!neighbors.isEmpty()) {
+			if(world.typeAnimals(x,y, neighbors)== "Sheep") {
+				Sheep sheep = new Sheep(x,y) ;
+				world.getAnimals().remove(sheep);	
+				hunger=hunger-1;
+			}else {
+				hunger++;
+			}
+				
+		} else {
+			hunger++;
+		}
+		this.moveRandom();
+		if (hunger<=10) {
+			return true;
+		}else {
+			return false;
+		}
+	}
+
+	private void moveRandom() {
+		int direction = rand.nextInt(4);
+		if(direction == 0) {
+			x+=1;
+		}
+		if(direction == 1) {
+			y+=1;
+		}
+		if(direction == 2) {
+			x-=1;
+		}
+		if(direction == 3) {
+			y-=1;
+		}
+	}
+
+
+}