"As oil gushed from its Macondo well in the Gulf of Mexico last year, BP vowed to contribute any money from the sale of recovered oil to a little-known environmental group, the National Fish and Wildlife Foundation.

"The company eventually sent $22 million to the foundation to help sea turtles and migrating birds. It also paid $5.2 million in royalties to the federal government on oil that was collected and shipped to refineries.

"But now the Interior Department is examining whether the company's royalty payments were enough, based on the market price of oil during the spill and the amount of oil that BP recovered."

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