def clean_species_name(common_name):
    """
    Converts various forms of "human" to the token "human", and various forms
    of "empty" to the token "empty"
    """
    
    _people_tags = {
        'Bicycle',
        'Calibration Photos',
        'Camera Trapper',
        'camera trappper',
        'camera  trapper',
        'Homo sapien',
        'Homo sapiens',
        'Human, non staff',
        'Human, non-staff',
        'camera trappe',
        'Human non-staff',
        'Setup Pickup',
        'Vehicle'
    }
    PEOPLE_TAGS = {x.lower() for x in _people_tags}

    _no_animal_tags = {'No Animal', 'no  animal', 'Time Lapse', 'Camera Misfire', 'False trigger', 'Blank'}
    NO_ANIMAL_TAGS = {x.lower() for x in _no_animal_tags}

    common_name = common_name.lower().strip()
    if common_name in PEOPLE_TAGS:
        return 'human'

    if common_name in NO_ANIMAL_TAGS:
        return 'empty'

    return common_name