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Freiwald, W. and Bonardi, X. and Leir, X. (1998) Hellbenders in the Wild. Better Farming, 1 (4). pp. 91-134.
Paulitsch, O. and Dransfield, P. (2002) Red Footed Tortoises in Captivity. Fine Animal Breeding, 2 (15). pp. 4-53.
Syvitski, C. (1998) Migration routes of the Hyacinth Macaw. In: 12th Conference on Animal Things, 4-9 February, Jura, Scotland.