Коровы плодятся и едят растения, даже есть какой то баланс.

main.py

@@ -3,24 +3,38 @@ from random import randint
 import numpy as np
 
 SCREEN_SIZE = (800,600)
-TICK_TIME = 1
+TICK_TIME = 0.5
 
 class Cow(arcade.SpriteCircle):
   ls = arcade.SpriteList()
   def __init__(self,parent=None):
     super().__init__(radius=5, color=arcade.color.BROWN)
     if parent:
-      pass
+      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 = 5
     Cow.ls.append(self)
   @classmethod
   def update(cls):
     for c in cls.ls:
+      c.age += 1
+      if c.age >= 30:
+        cls.ls.remove(c)
+        continue
+      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:
         near_plant = Plant.get_near(c.center_x,c.center_y)
         if near_plant:
           vec = cls.get_vector(c.center_x,near_plant.center_x,
@@ -30,6 +44,9 @@ class Cow(arcade.SpriteCircle):
           if 0 < new_x < SCREEN_SIZE[0] and 0 < new_y < SCREEN_SIZE[1]:
             c.center_x = new_x
             c.center_y = new_y
+            c.health -= 1
+            if c.health <= 0:
+              cls.ls.remove(c)
     
   @classmethod
   def draw(cls):
@@ -97,7 +114,6 @@ class MainView(arcade.View):
     super().__init__()
     self.background_color = (100,100,200)
     Plant()
-    Cow()
     self.time = 0
     self.cur_time = 0
     self.text = None
@@ -109,6 +125,8 @@ class MainView(arcade.View):
       Cow.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):