def env_translate_obs(obs):
    """
    This should only be used for the Tiger ENV.

    Parameters
    ----------
    obs : list or array-like
        The observation to be translated.

    Returns
    -------
    str
        A representation of the observation in English.
    """
    if obs[0] == 1:
        return 'GROWL_LEFT'
    elif obs[1] == 1:
        return 'GROWL_RIGHT'
    elif obs[2] == 1:
        return 'START'
    elif obs[3] == 1:
        return 'END'
    else:
        raise ValueError('Invalid observation: '.format(obs))