--- a/gamelib/animal.py	Thu Sep 03 23:05:36 2009 +0000
+++ b/gamelib/animal.py	Thu Sep 03 23:11:11 2009 +0000
@@ -30,7 +30,6 @@
         self.equipment = []
         self.abode = None
         self.facing = 'left'
-        self.lives = 1
 
     def loop(self, tv, _sprite):
         ppos = tv.tile_to_view(self.pos.to_tuple())
@@ -92,12 +91,22 @@
     def weapons(self):
         return [e for e in self.equipment if equipment.is_weapon(e)]
 
+    def armour(self):
+        return [e for e in self.equipment if equipment.is_armour(e)]
+
     def covers(self, tile_pos):
         return tile_pos[0] == self.pos.x and tile_pos[1] == self.pos.y
 
     def outside(self):
         return self.abode is None
 
+    def survive_damage(self):
+        for a in self.armour():
+            if not a.survive_damage():
+                self.unequip(a)
+            return True
+        return False
+
 class Chicken(Animal):
     """A chicken"""
 
@@ -291,8 +300,7 @@
 
     def _catch_chicken(self, chicken, gameboard):
         """Catch a chicken"""
-        chicken.lives -= 1
-        if not chicken.lives > 0:
+        if not chicken.survive_damage():
             sound.play_sound("kill-chicken.ogg")
             gameboard.remove_chicken(chicken)
         self.closest = None

--- a/gamelib/equipment.py	Thu Sep 03 23:05:36 2009 +0000
+++ b/gamelib/equipment.py	Thu Sep 03 23:11:11 2009 +0000
@@ -66,22 +66,33 @@
     CHICKEN_IMAGE_FILE = 'sprites/equip_knife.png'
 
 class Armour(Equipment):
+    IS_ARMOUR = True
     DRAW_LAYER = 5
 
+    def __init__(self):
+        super(Armour, self).__init__()
+        self.hitpoints = self.STARTING_HITPOINTS
+
     def place(self, animal):
         """Give additional lives"""
         for eq in animal.equipment:
             if eq.NAME == self.NAME:
                 return False
-        animal.lives += self.PROTECTION
         return True
 
+    def survive_damage(self):
+        self.hitpoints -= 1
+        if self.hitpoints > 0:
+            self._sell_price = int(self._sell_price*self.hitpoints/float(self.hitpoints+1))
+            return True
+        return False
+
 class Helmet(Armour):
     NAME = "helmet"
     BUY_PRICE = 25
     SELL_PRICE = 15
 
-    PROTECTION = 1
+    STARTING_HITPOINTS = 1
 
     CHICKEN_IMAGE_FILE = 'sprites/helmet.png'
 
@@ -90,7 +101,7 @@
     BUY_PRICE = 100
     SELL_PRICE = 75
 
-    PROTECTION = 2
+    STARTING_HITPOINTS = 2
 
     CHICKEN_IMAGE_FILE = 'sprites/kevlar.png'
 
@@ -101,6 +112,9 @@
 def is_weapon(obj):
     return is_equipment(obj) and getattr(obj, 'IS_WEAPON', False)
 
+def is_armour(obj):
+    return is_equipment(obj) and getattr(obj, 'IS_ARMOUR', False)
+
 EQUIPMENT = []
 for name in dir():
     obj = eval(name)

--- a/gamelib/gameboard.py	Thu Sep 03 23:05:36 2009 +0000
+++ b/gamelib/gameboard.py	Thu Sep 03 23:11:11 2009 +0000
@@ -563,8 +563,7 @@
 
     def kill_fox(self, fox):
         if fox in self.foxes:
-            fox.lives -= 1
-            if not fox.lives > 0:
+            if not fox.survive_damage():
                 self.killed_foxes += 1
                 self.toolbar.update_fox_counter(self.killed_foxes)
                 self.add_cash(constants.SELL_PRICE_DEAD_FOX)