def enough_calls(annotations, bird_class):
    """ Returns true if an audio file is sufficiently annotated.
        Sufficiently means that the file has at least one annotation
        of a bird species.
    """

    desired_bird_count = 0

    for annotation in annotations:
        if annotation['annotationtag_id'] == bird_class:
            desired_bird_count += 1

    return desired_bird_count