Its interesting that in many cases its the gravid females that do it...just what I've found with veiled chameleons.
Bats eat dirt to stay healthy....
http://www.livescience.com/animals/080604-bat-dirt.html
Desert Tortoise...
http://www.sciencedirect.com/scienc...7b8dc17c530db829d718c11397372771&searchtype=a
Clay licks and colpas....
http://www.perunature.com/node/120
Trampling, wallowing, geophagy in mammals...
http://books.google.ca/books?id=Vc6...wCQ#v=onepage&q=GEOPHAGY AND REPTILES&f=false
Dirt eating for healthy living......
http://cogweb.ucla.edu/Abstracts/Diamond_99.html
Detoxification function of geophagy and domestication of the potato ......
http://www.springerlink.com/content/l118j6v577577148/
Veterinary Herbal Medicine.....
http://books.google.ca/books?id=iLb...DgU#v=onepage&q=GEOPHAGY AND REPTILES&f=false
Bats eat dirt to stay healthy....
http://www.livescience.com/animals/080604-bat-dirt.html
Desert Tortoise...
http://www.sciencedirect.com/scienc...7b8dc17c530db829d718c11397372771&searchtype=a
Clay licks and colpas....
http://www.perunature.com/node/120
Trampling, wallowing, geophagy in mammals...
http://books.google.ca/books?id=Vc6...wCQ#v=onepage&q=GEOPHAGY AND REPTILES&f=false
Dirt eating for healthy living......
http://cogweb.ucla.edu/Abstracts/Diamond_99.html
Detoxification function of geophagy and domestication of the potato ......
http://www.springerlink.com/content/l118j6v577577148/
Veterinary Herbal Medicine.....
http://books.google.ca/books?id=iLb...DgU#v=onepage&q=GEOPHAGY AND REPTILES&f=false