Author : Young, Richard. 1 Estimating the population of the endangered flat-tailed tortoise Pyxis planicauda in the deciduous, dry forest of western Madagascar : a monitoring baseline. Serial title : Oryx. 2008/04. Authors : Bourou, Robert. Durbin, Joanna. Fa, John. LEWIS, Richard. Toto Volahy, Anselme. Young, Richard.