Bama, a 1000-pound manatee, feeds on vegetation in Scipio Creek off the Apalachicola River in Florida, Friday, June 18, 2010. Manatees breathe by sticking their nostrils out of the water every two or three minutes when they are feeding. Bama is tagged with a tansmitter tethered to her tail. The transmitter bobs inside a small bouy with an antennae. Allen Aven, graduate student in marine sciences at the Dauphin Island Sea Lab, 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.