diff --git a/src/backend/Simulator.java b/src/backend/Simulator.java
index 362d3eb..9092851 100644
--- a/src/backend/Simulator.java
+++ b/src/backend/Simulator.java
@@ -225,15 +225,33 @@ public class Simulator extends Thread {
 	 * method called when clicking on a cell in the interface
 	 */
 	public void clickCell(int x, int y) {
+		
 		if (clickActionFlag==0) { // cell
 			world.setCell(x, y, getCell(x, y) == 1 ? 0 : 1);
+			
 		} else if (clickActionFlag==1) { // sheep
-			Sheep sheep = new Sheep(x,y);
-			agents.add(sheep);
+			ArrayList<Agent> nearby=getNeighboringAnimals(x,y,1);
+			if (nearby.isEmpty()) {
+				Sheep sheep = new Sheep(x,y);
+				agents.add(sheep);
+			}else {
+				for (Agent animal:nearby) {
+					agents.remove(animal);
+				}
+			}
+			
+			
 		} else if (clickActionFlag==2) { // wolf
-			Wolf wolf = new Wolf(x,y);
-			agents.add(wolf);
-		}
+			ArrayList<Agent> nearby=getNeighboringAnimals(x,y,1);
+			if (nearby.isEmpty()) {
+				Wolf wolf = new Wolf(x,y);
+				agents.add(wolf);
+			}else {
+				for (Agent animal:nearby) {
+					agents.remove(animal);
+				}
+			}
+		} 
 
 	}