def lung_capacity(mass):
    """Caclulate lung capacity

    Args
    ----
    mass: float
        Mass of animal

    Return
    ------
    volume: float
        Lung volume of animal

    References
    ----------
    Kooyman, G.L., Sinnett, E.E., 1979. Mechanical properties of the harbor
    porpoise lung, Phocoena phocoena. Respir Physiol 36, 287–300.
    """
    return 0.135 * (mass ** 0.92)