def intersect(object1, object2, radius = 15):
  """
  Takes two Turtle objects and an optional radius.
  Returns True if the objects are less than radius apart.
  """
  xbounds = (object1.xcor()-radius, object1.xcor() + radius)
  ybounds = (object1.ycor()-radius, object1.ycor() + radius)
  x, y = object2.pos()
  check_x = x > min(xbounds) and x < max(xbounds)
  check_y = y > min(ybounds) and y < max(ybounds)
  if (check_x and check_y):
    return True
  else:
    return False