Coyotes
http://www.oznet.ksu.edu/pr_histpubs/Pubs/SB393.pdf
http://www.canids.org/canidnews/7/Old_aged_coyote.pdf
http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1608&context=icwdm_usdanwrc
2.0.CO%3B2-X" target="_blank">http://links.jstor.org/sici?sici=0022-541X(196704)31%3A22.0.CO%3B2-X
Gray wolves
http://www.npwrc.usgs.gov/resource/mammals/toothage/discuss.htm
Red Fox
2.0.CO%3B2-O" target="_blank">http://links.jstor.org/sici?sici=0022-541X(197401)38%3A12.0.CO%3B2-O
http://www.oznet.ksu.edu/pr_histpubs/Pubs/SB393.pdf
http://www.canids.org/canidnews/7/Old_aged_coyote.pdf
http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1608&context=icwdm_usdanwrc
2.0.CO%3B2-X" target="_blank">http://links.jstor.org/sici?sici=0022-541X(196704)31%3A22.0.CO%3B2-X
Gray wolves
http://www.npwrc.usgs.gov/resource/mammals/toothage/discuss.htm
Red Fox
2.0.CO%3B2-O" target="_blank">http://links.jstor.org/sici?sici=0022-541X(197401)38%3A12.0.CO%3B2-O
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