It will take ExxonMobil Corporation, the world’s largest oil company, less than half an hour to replace the money it will have to pay the U.S. government for killing 85 migratory birds during the past five years at its natural gas facilities in the central portion of the country. The company pled guilty in a Denver federal court on Thursday to five charges of violating the federal Migratory Bird Treaty Act, which will result in $400,000 in fines and $200,000 in community service payments. Based on the $8.6 billion in revenues ExxonMobil made last year, the $600,000 penalty is about what the oil giant made every 20 minutes in 2008.