This undated file photo shows Francisco Piedrahita, 65, head of the ICESI University as he gestures during an interview in Cali, Colombia. Piedrahita was last seen leaving a taxi to photograph birds ... more 
This undated file photo shows Francisco Piedrahita, 65, head of the ICESI University as he gestures during an interview in Cali, Colombia. Piedrahita was last seen leaving a taxi to photograph birds at a national park near New Orleans and there has been no sign of him since, said Col. John Fortunato, spokesman for the Jefferson Parish Sheriff's Office. less 
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Associated Press | Photo By El Pais de Cali
Wed, May 25, 2011 2:19 PM EDT