My money (if I had any left) would be on: Mara.
http://en.wikipedia.org/wiki/Mara_(mammal)
(if that doesn't work, this is the same: http://tinyurl.com/4p7pr8)
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http://en.wikipedia.org/wiki/Mara_(mammal)
(if that doesn't work, this is the same: http://tinyurl.com/4p7pr8)
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