Desert Tortoise Council - An international nonprofit organization whose members share a common fascination with wild desert tortoises and the environment they depend upon. Desert Tortoise Preserve Committee - Group helps establish tortoise preserves, implements management programs for reserves and educational programs that evaluate measures aimed at ecosystem and critical habitat recovery. Gopher Tortoise Organization - Conservation and management of the Gopher Tortoises (Gopherus polyphemus) and their habitat. Gopherus polyphemus - Taxonomy, description and photograph of the gopher tortoise, its habitat and distribution, life history, community ecology and special status. Western Swamp Tortoise (Pseudemydura umbrina) - This species has the smallest surviving population of any Australian reptile. Factsheet with information, lifestyle and threats. Gopherus agassizii: Desert Tortoise - Many photographs, description, biology and taxonomy. Ploughshare Tortoise: Astrochelys yniphora - Photographs, videos and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation. Angulate Tortoise: Chersina angulata - Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.