Barbara Livingston on Twitter: "Goodbye, dearly loved champion BLACK RUBY, who reportedly died Saturday. BLACK RUBY has been called "the winningest racing mule of all time." She was the AMRA World Champion
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Barbara Livingston on Twitter: "7-time champion racing mule BLACK RUBY (left), is still lively and...dare I say happy? ;)...at age 25 in Healdsburg, CA. (photo Feb. 2017). https://t.co/glheBB2tH4" / Twitter