tortoise: References & Edit History
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Article Contributors
Primary Contributors
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George R. Zug
Curator Emeritus, Division of Amphibians and Reptiles, National Museum of Natural History, Smithsonian Institution, Washington, D.C.
Other Encyclopedia Britannica Contributors
Article History
| Type | Description | Contributor | Date |
|---|---|---|---|
| Modified link of Web site: National Center for Biotechnology Information - PubMed Central - Global assessment of current extinction risks and future challenges for turtles and tortoises. | Sep 05, 2026 | ||
| Add new Web site: Cell Press - iScience - Chemical and mechanical patterning of tortoise skin scales occur in different regions of the head. | Jul 24, 2026 | ||
| Add new Web site: National Center for Biotechnology Information - PubMed Central - Global assessment of current extinction risks and future challenges for turtles and tortoises. | Mar 28, 2026 | ||
| Add new Web site: Cell Press - iScience - Chemical and mechanical patterning of tortoise skin scales occur in different regions of the head. | Dec 11, 2025 | ||
| Add new Web site: White Rose Research Online - Spatial Learning and Memory in the Tortoise (Geochelone carbonaria) (PDF). | Sep 06, 2025 | ||
| Added reference to “Jonathan,” a Seychelles giant tortoise. | May 22, 2025 | ||
| Add new Web site: Defenders of Wildlife - Tortoises. | Feb 27, 2025 | ||
| Add new Web site: International Fund for Animal Welfare - Tortoises. | Jan 17, 2025 | ||
| Media added. | Aug 02, 2024 | ||
| Add new Web site: Gemological Institute of America - The Characterization of Tortoise Shell and its Imitations. | Jun 25, 2024 | ||
| Add new Web site: Animal Diversity Web - Testudinidae. | Jan 13, 2023 | ||
| Add new Web site: AZ Animals - Tortoise. | Jul 25, 2022 | ||
| Add new Web site: The Spruce Pets - An Introduction to Pet Tortoises. | May 15, 2019 | ||
| Media added. | Oct 17, 2016 | ||
| Media added. | Jun 14, 2016 | ||
| Added video. | May 20, 2015 | ||
| Add new Web site: San Diego Zoo Animals and Plants - Turtle and Tortoise. | Jun 12, 2014 | ||
| Added photograph. | Nov 21, 2011 | ||
| Added new Web site: San Diego Zoo - Reptiles: Turtle & Tortoise. | Nov 26, 2008 | ||
| Added new Web site: Animal Planet - African Sulcata Tortoise. | Nov 26, 2008 | ||
| Article revised and updated. | May 02, 2008 | ||
| Added new Web site: Melissa Kaplan's Herp Care Collection - Sulcata Tortoises. | May 01, 2008 | ||
| Added new Web site: Melissa Kaplan's Herp Care Collection - Chaco Tortoises. | May 01, 2008 | ||
| Added new Web site: Animal Corner - Tortoises. | Feb 07, 2008 | ||
| Added new Web site: California Turtle and Tortoise Club - General Information on Turtles and Tortoises. | Jun 30, 2006 | ||
| Article revised. | Apr 07, 1999 | ||
| Article added to new online database. | Jul 20, 1998 |
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