Article Photos: Oklahoma wildlife officials trying to stop invasion of bighead, silver carp 2/3

White pelicans take flight at Lake Overholser in Oklahoma City on Monday. A flock of pelicans rest at the lake during their migration to the Gulf Coast. Pelicans are annually spotted by bird watchers during Oklahoma City's annual Christmas Bird Count. PHOTO BY STEVE GOOCH, THE OKLAHOMAN <strong>Steve Gooch</strong>