R.V. Lansdown J.A. Kushlan Robert W. Butler T. W. Custer I.J. Davidson R.M. Erwin J.A. Hancock A.M. Lyles M. Maddock L. Marion G. Morales T. Mundkur C. Perennou O. Pineau D. Turner P. Ulenaers J. VanVessem L. Young J.A. Kushlan H. Hafner H. Hafner 2000 Abstract not submitted to date application/pdf en Academic Press Conservation of herons chapter