private Location findFood(Location location)
    {
        Field field = getField();
        List<Location> adjacent = closestPrey(field.adjacentLocations(getLocation(), 2));
        Iterator<Location> it = adjacent.iterator();
        while(it.hasNext()) {
            Location where = it.next();
            Object animal = field.getObjectAt(where);
            if(animal instanceof Rabbit) {
                Rabbit rabbit = (Rabbit) animal;
                if(rabbit.isAlive()) { 
                    rabbit.setDead();
                    foodLevel = RABBIT_FOOD_VALUE;
                    // Remove the dead rabbit from the field.
                    return where;
                }
            }
            if(animal instanceof Fox) {
                Fox fox = (Fox) animal;
                if(fox.isAlive()) { 
                    fox.setDead();
                    foodLevel = FOX_FOOD_VALUE;
                    // Remove the dead rabbit from the field.
                    return where;
                }
            }
        }
        return null;
    }