Allen Aven, graduate student in marine sciences at the Dauphin Island Sea Lab, looks for the bobbing tracking device tethered to the tail of Bama, a 1000-pound manatee in Scipio Creek off the Apalachicola River in Florida, Friday, June 18, 2010, in order to observe her behavior. Aven is closely monitoring Bama, and Bumpy, two manatees tagged by the Dauphin Island Sea Lab, for changes in their behavior since the Deepwater Horizon oil spill.