diff --git a/index.html b/index.html
index bcdf23b..8dc8a19 100644
--- a/index.html
+++ b/index.html
@@ -16,6 +16,10 @@
     <script src="models/unit.js"></script>
     <script src="models/monsters/croco-turtle.js"></script>
     <script src="models/monsters/monster-bear.js"></script>
+    <script src="models/monsters/greedy-pig.js"></script>
+    <script src="models/monsters/lazy-ira.js"></script>
+    <script src="models/monsters/dino-nerve.js"></script>
+    <script src="models/monsters/crazy-dove.js"></script>ß
     <script src="models/monsters/dragon.js"></script>
     <script src="models/monsters/pirate.js"></script>
     <script src="models/monsters/tree.js"></script>
diff --git a/models/monsters/crazy-dove.js b/models/monsters/crazy-dove.js
new file mode 100644
index 0000000..c511d23
--- /dev/null
+++ b/models/monsters/crazy-dove.js
@@ -0,0 +1,10 @@
+var CrazyDove = (function() {
+    function CrazyDove(level) {
+      Unit.call(this, 5, 25, level);
+    }
+  
+    CrazyDove.prototype = Object.create(Unit.prototype);
+    CrazyDove.prototype.constructor = CrazyDove;
+  
+    return CrazyDove;
+  })();
\ No newline at end of file
diff --git a/models/monsters/dino-nerve.js b/models/monsters/dino-nerve.js
new file mode 100644
index 0000000..85bf052
--- /dev/null
+++ b/models/monsters/dino-nerve.js
@@ -0,0 +1,10 @@
+var DinoNerve = (function() {
+    function DinoNerve(level) {
+      Unit.call(this, 20, 900, level);
+    }
+  
+    DinoNerve.prototype = Object.create(Unit.prototype);
+    DinoNerve.prototype.constructor = DinoNerve;
+  
+    return DinoNerve;
+  })();
\ No newline at end of file
diff --git a/models/monsters/greedy-pig.js b/models/monsters/greedy-pig.js
new file mode 100644
index 0000000..4e3e63c
--- /dev/null
+++ b/models/monsters/greedy-pig.js
@@ -0,0 +1,11 @@
+var GreedyPig = (function() {
+    function GreedyPig(level) {
+      Unit.call(this, 80, 10, level);
+    }
+  
+    GreedyPig.prototype = Object.create(Unit.prototype);
+    GreedyPig.prototype.constructor = GreedyPig;
+  
+    return GreedyPig;
+  })();
+  
\ No newline at end of file
diff --git a/models/monsters/lazy-ira.js b/models/monsters/lazy-ira.js
new file mode 100644
index 0000000..391c54e
--- /dev/null
+++ b/models/monsters/lazy-ira.js
@@ -0,0 +1,10 @@
+var LazyIra = (function() {
+    function LazyIra(level) {
+      Unit.call(this, 10, 1000, level);
+    }
+  
+    LazyIra.prototype = Object.create(Unit.prototype);
+    LazyIra.prototype.constructor = LazyIra;
+  
+    return LazyIra;
+  })();
\ No newline at end of file
diff --git a/models/unit.js b/models/unit.js
index 45d2572..01ebdb6 100644
--- a/models/unit.js
+++ b/models/unit.js
@@ -8,8 +8,11 @@ var Unit = (function() {
     this.level = level;
   }
 
-  Unit.prototype.attack = function() {
-    console.log('Attack', this);
+  Unit.prototype.attack = function(monster) {
+    if (monster instanceof Unit) {
+      return this.health -= monster.damage;
+    }
+    console.error('You are not a monster!')
   };
 
   Unit.prototype.render = function() {