ExxonMobil pleaded guilty Thursday to killing 85 birds at plants in five states, and agreed to pay a fine of $600,000. The company, which earned more than $4 billion in the second quarter of 2009, violated the Migratory Bird Act by exposing protected owls, raptors and waterfowl to hydrocarbons in uncovered natural gas pits, oil tanks and waste water facilities at ExxonMobil drilling and production plants in Colorado, Wyoming, Kansas, Oklahoma and Texas.