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  Category:Gopherus agassizii – Wikimedia Commons

  https://commons.wikimedia.org/wiki/Category:Gopherus_agassizii?uselang=de

  Keine Beschreibung vorhanden.

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  Category:Gopherus polyphemus – Wikimedia Commons

  https://commons.wikimedia.org/wiki/Category:Gopherus_polyphemus?uselang=de

  Keine Beschreibung vorhanden.

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  Desert Tortoise - DesertUSA

  http://www.desertusa.com/june96/du_tort.html

  The tortoise is able to live where ground temperatures may exceed 140 degrees F, because of its ability to dig underground burrows and to escape the heat. At least 95% of its life is spent in burrows.

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  Robert Fleischer - Google Scholar Citations

  https://scholar.google.de/citations?hl=de&user=DUywBPsAAAAJ&view_op=list_works&sortby=pubdate

  Keine Beschreibung vorhanden.

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