I sent this question to Naomi Miller, and here is her reply:
There are several photos of dung on the web; generally, herbivore dung
has a fibrous texture. The best way to to find out what it looks like
is to collect it (that of sheep/goat, for example is dense and is
smaller than camel; horse dung has a distinctive shape and is full of
grass, etc.)
An attractive photo of sheep/goat dung pellets is on Simone Riehl's
website:
http://homepages.uni-tuebingen.de/simone.riehl/
Photos appear occasionally in articles
Also, Akeret and Jacomet (1997)--drawing
see reference in bibliography:
http://www.sas.upenn.edu/~nmiller0/dung.html
Also, is "the dung file" website: http://www.scirpus.ca/dung/dung.shtml
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