In this April 1, 2011 photo, Tulane University population ecologist Jessica Henkel takes a blood sample from a dunlin sandpiper on Fourchon Beach in Port Fourchon, La., as part of a research project ... more 
In this April 1, 2011 photo, Tulane University population ecologist Jessica Henkel takes a blood sample from a dunlin sandpiper on Fourchon Beach in Port Fourchon, La., as part of a research project that is looking for long-term, not immediately lethal effects from the BP PLC oil spill on birds that stop along the Gulf Coast during their migration. “It's much easier to see a dead pelican on the beach” than it is to see more chronic population-wide effects, Henkel said. less 
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Associated Press | Photo By Patrick Semansky
Mon, Apr 18, 2011 1:29 AM EDT