diff --git a/main.py b/main.py
index b5ae2e8..33de189 100644
--- a/main.py
+++ b/main.py
@@ -5,6 +5,69 @@ import numpy as np
 SCREEN_SIZE = (800,600)
 TICK_TIME = 0.5
 
+class Wolf(arcade.SpriteCircle):
+  ls = arcade.SpriteList()
+  def __init__(self,parent=None):
+    super().__init__(radius=5, color=arcade.color.RED)
+    if parent:
+      self.center_x = parent.center_x
+      self.center_y = parent.center_y
+    else:
+      self.center_x = randint(1,SCREEN_SIZE[0])
+      self.center_y = randint(1,SCREEN_SIZE[1])
+    self.age = 0
+    self.age_to_bride = 3
+    self.health = 30
+    self.speed = 8
+    self.move_target = 0
+    self.target_timer = 0
+    Wolf.ls.append(self)
+  @classmethod
+  def update(cls):
+    if len(cls.ls) == 0:
+      Wolf()
+    for e in cls.ls:
+      e.age += 1
+      if e.age >= 30:
+        cls.ls.remove(e)
+        continue
+
+      if e.health >= 50 and e.age_to_bride < e.age:
+        Wolf(e)
+        e.health -= 30
+
+      hit_cow = arcade.check_for_collision_with_list(e,Cow.ls)
+      for c in hit_cow:
+        e.health += c.health
+        Cow.ls.remove(c)
+      else:
+        if e.target_timer <= 0:
+          e.move_target = Cow.get_near(e.center_x,e.center_y)
+          e.target_timer = 3
+        if e.move_target:
+          vec = cls.get_vector(e.center_x,e.move_target.center_x,
+                             e.center_y,e.move_target.center_y)
+          new_x = e.center_x + vec[0]*e.speed
+          new_y = e.center_y + vec[1]*e.speed
+          if 0 < new_x < SCREEN_SIZE[0] and 0 < new_y < SCREEN_SIZE[1]:
+            e.center_x = new_x
+            e.center_y = new_y
+            e.health -= 1
+            if e.health <= 0:
+              cls.ls.remove(e)
+    
+  @classmethod
+  def draw(cls):
+    cls.ls.draw()
+  @staticmethod
+  def get_vector(src_x,target_x,src_y,target_y):
+    source = np.array([src_x, src_y])
+    target = np.array([target_x, target_y])
+    direction = target - source
+    length = np.linalg.norm(direction)
+    return direction / length
+    
+
 class Cow(arcade.SpriteCircle):
   ls = arcade.SpriteList()
   def __init__(self,parent=None):
@@ -23,20 +86,31 @@ class Cow(arcade.SpriteCircle):
     self.target_timer = 0
     Cow.ls.append(self)
   @classmethod
+  def get_near(cls,x,y):
+    dist_list = list()
+    for e in cls.ls:
+      dist_list.append((e,((e.center_x - x)**2 + (e.center_y - y)**2)**0.5))
+    dist_list.sort(key=lambda x: x[1])
+    if len(dist_list) == 0:
+      return None
+    return dist_list[0][0]
+  @classmethod
   def update(cls):
+    if len(cls.ls) == 0:
+      Cow()
     for c in cls.ls:
       c.age += 1
       if c.age >= 30:
         cls.ls.remove(c)
-        if len(cls.ls) == 0:
-          Cow()
         continue
+
+      if c.health >= 50 and c.age_to_bride < c.age:
+        Cow(c)
+        c.health -= 30
+
       hit_plant = arcade.check_for_collision_with_list(c,Plant.ls)
       for p in hit_plant:
         c.health += p.width
-        if c.health >= 50 and c.age_to_bride < c.age:
-          Cow(c)
-          c.health -= 30
         Plant.ls.remove(p)
       else:
         if c.target_timer <= 0:
@@ -57,8 +131,6 @@ class Cow(arcade.SpriteCircle):
   @classmethod
   def draw(cls):
     cls.ls.draw()
-    for p in cls.ls:
-      p.draw_hit_box()
   @staticmethod
   def get_vector(src_x,target_x,src_y,target_y):
     source = np.array([src_x, src_y])
@@ -89,21 +161,24 @@ class Plant(arcade.SpriteCircle):
     for p in cls.ls:
       dist_list.append((p,((p.center_x - x)**2 + (p.center_y - y)**2)**0.5 - p.width ))
     dist_list.sort(key=lambda x: x[1])
+    if len(dist_list) == 0:
+      return None
+    if len(dist_list) < 3:
+      return dist_list[0][0]
     return dist_list[randint(0,3)][0]
   @classmethod
   def update(cls):
     for p in cls.ls:
       p.age += 1
-      if p.center_x - p.width//2 > 0 and p.center_x + p.width//2 < SCREEN_SIZE[0] and p.center_y - p.height//2 > 0 and p.center_y + p.width//2 < SCREEN_SIZE[1]:
-        hit_list = arcade.check_for_collision_with_list(p,cls.ls)
-        if not hit_list:
-          p.width += 2
-          p.height += 2
-        else:
-          for h in hit_list:
-            if p.width < h.width:
-              cls.ls.remove(p)
-              break
+      hit_list = arcade.check_for_collision_with_list(p,cls.ls)
+      if p.center_x - p.width//2 > 0 and p.center_x + p.width//2 < SCREEN_SIZE[0] and p.center_y - p.height//2 > 0 and p.center_y + p.width//2 < SCREEN_SIZE[1] and not hit_list:
+        p.width += 2
+        p.height += 2
+      else:
+        for h in hit_list:
+          if p.width < h.width:
+            cls.ls.remove(p)
+            break
       if p.age >= p.age_to_plant:
         Plant(p)
   @classmethod
@@ -127,17 +202,15 @@ class MainView(arcade.View):
       print(f'Total plants: {len(Plant.ls)}, total cows: {len(Cow.ls)}')
       Plant.update()
       Cow.update()
+      Wolf.update()
       self.time += 1
       self.cur_time = 0
-      if self.time == 30:
-        Cow()
-    #self.text = arcade.Text(f'Time: {self.time}',20,100,(255,255,255))
     
   def on_draw(self):
     self.clear()
     Plant.draw()
     Cow.draw()
-    #self.text.draw()
+    Wolf.draw()
     
 
 if __name__ == '__main__':