SAN DIEGO, CA - FEBRUARY 21:  Mitchell Augustus Walker masterfully plays the Australian Didgeredoo during "Koalapalooza" at the San Diego Zoo on Feb 21, 2011 in San Diego, CA.
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SAN DIEGO, CA - FEBRUARY 21: Mitchell Augustus Walker masterfully plays the Australian Didgeredoo during "Koalapalooza" at the San Diego Zoo on Feb 21, 2011 in San Diego, CA.