By L. David Mech, Bruce W. Christensen, Cheryl S. Asa , Margaret Callahan, Julie K. Young - http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0088861, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=38538808

By L. David Mech, Bruce W. Christensen, Cheryl S. Asa , Margaret Callahan, Julie K. Young - http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0088861, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=38538808
By L. David Mech, Bruce W. Christensen, Cheryl S. Asa , Margaret Callahan, Julie K. Young - http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0088861, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=38538808
By L. David Mech, Bruce W. Christensen, Cheryl S. Asa , Margaret Callahan, Julie K. Young - http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0088861, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=38538808 By Pavan Kunder - [1], CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=24491190
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