How to use the cowpy.cow.Tux function in cowpy

class Tux(Cowacter):
    def __init__(self, **kwargs):
        kwargs['body'] = (
            "   {thoughts}\n"
            "    {thoughts}\n"
            "        .--.\n"
            "       |o_o |\n"
            "       |:_/ |\n"
            "      //   \\ \\\n"
            "     (|     | )\n"
            "    /'\\_   _/`\\\n"
            "    \\___)=(___/")
        super(Tux, self).__init__(**kwargs)


COWACTERS['tux'] = Tux


class Udder(Cowacter):
    def __init__(self, **kwargs):
        kwargs['body'] = (
            "  {thoughts}\n"
            "   {thoughts}    (__)\n"
            "        {eyes}\\\n"
            "       ('') \\---------\n"
            "        {tongue}  \\           \\\n"
            "           |          |\\\n"
            "           ||---(  )_|| *\n"
            "           ||    UU  ||\n"
            "           ==        ==")
        super(Udder, self).__init__(**kwargs)

def __init__(self, **kwargs):
        kwargs['body'] = (
            "   {thoughts}\n"
            "    {thoughts}\n"
            "        .--.\n"
            "       |o_o |\n"
            "       |:_/ |\n"
            "      //   \\ \\\n"
            "     (|     | )\n"
            "    /'\\_   _/`\\\n"
            "    \\___)=(___/")
        super(Tux, self).__init__(**kwargs)

"bunny":cow.Bunny(),
    "cheese":cow.Cheese(),
    "milk":cow.Milk(),
    "bong":cow.BongCow(),
    "eyes":cow.Eyes(),
    "legitvore":cow.HeadInCow(),
    "666":cow.Satanic(),
    "frogs":cow.BudFrogs(),
    "daemon":cow.Daemon(),
    "moofasa":cow.Moofasa(),
    "mutilated":cow.Mutilated(),
    "skeleton":cow.Skeleton(),
    "small":cow.Small(),
    "excusemewhatthefuck":cow.Sodomized(),
    "garfield":cow.Stimpy(),
    "tux":cow.Tux(),
    "vader":cow.Vader()
}

def write_file(filename, contents):
    with open(filename, "w", encoding="utf8") as file:
        for item in contents:
            file.write(str(item))
            file.write("\n")

def download_file(url, destination):
    req = requests.get(url)
    file = open(destination, "wb")
    for chunk in req.iter_content(100000):
        file.write(chunk)
    file.close()