function zombie_spawn()
{
    can_drop = false;
    drop_type = undefined;

    if(RandomInt(0, 100) <= PERK_VULTUREAID_DROP_CHANCE)
        can_drop = true;

    if(self is_stink_zombie())
        drop_type = "stink";

    if(IS_TRUE(can_drop) && !isdefined(drop_type))
    {
        roll RandomInt(0, 100);
        chance_ammo = PERK_VULTUREAID_DROP_AMMO_CHANCE;
        chance_points = PERK_VULTUREAID_DROP_POINTS_CHANCE;
        chance_stink = PERK_VULTUREAID_STINK_DROP_CHANCE;

        chance_ammo_points= chance_ammo + chance_points;

        if(roll <= chance_ammo_points)
        {
            if(RandomInt(0, 100) <= 50)
                drop_type = "ammo";
            else
                drop_type = "points";
        }
        else if(roll <= chance_stink)
            drop_type = "stink";
    }

    if(isdefined(drop_type))
    {
        if(isdefined(level.perk_vulture.drop_count[drop_type]))
        {
            count = level.perk_vulture.drop_count[drop_type];
            max = level.perk_vulture.drop_count_max[drop_type];

            if(count >= max)
            {
                can_drop = false;
                drop_type = undefined;
            }
        }
        else
        {
            // Assume ammo / points
            ammo_count = level.perk_vulture.drop_count["ammo"];
            points_count = level.perk_vulture.drop_count["points"];
            max = level.perk_vulture.drop_count_max["ammo_points"];

            if(ammo_count + points_count >= max)
            {
                can_drop = false;
                drop_type = undefined;
            }
        }
    }

    if(IS_TRUE(can_drop) && isdefined(drop_type))
    {
        level.perk_vulture.drop_count[drop_type]++;

        IPrintLnBold("Zombie can drop");
        IPrintLnBold(drop_type);

        self._vulture_drop_type = drop_type;
    }
}