BP Deepwater Horizon oil in land-animal food chain

Researchers in Louisiana have discovered traces of oil from the Deepwater Horizon spill in the feathers of birds eaten by land animals. A team examined the feathers and digestive tract contents of seaside sparrows - measuring signature carbon from spilled oil. They say it "is the first demonstration that oil from the spill made it into the" food chain of land animals. The findings are published in the journal Environmental Research Letters. The study focused on seaside sparrows and the soil sediments of the Louisiana marshes.