def METHOD_NAME(self, collections):
    """
    Returns endemism summary data from the provided collections
    """
    return dict(collections.annotate(
            value=Case(When(taxonomy__endemism__isnull=False,
                            then=F('taxonomy__endemism__name')),
                       default=Value('Unknown'))
        ).values('value').annotate(
            count=Count('value')).values_list('value', 'count'))