Been meaning to post this anyway, but the
guinea pig vs. rat discussion below makes
it a little more relevant. 
I found this link on another forum, thought it
was pretty interesting.
Click on following to go to link
LINK
or if that doesn't work, cut and paste the following into
browser
http://www.nal.usda.gov/awic/zoo/WholePreyFinal02May29.pdf
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Thanks,
Ed

