Several environmental groups, including the Sierra Club, are suing the USFWS over the use of genetically-modified crops planted on national wildlife refuges in Illinois, Missouri and Iowa. The groups claim the use of engineered crops like Round Up-ready corn and beans leads to a higher use of herbicides and resulted in a proliferation of herbicide-resistant weeds. The suit also claims pesticides known as neonicotinoids are causing irreparable harm to honey bees. Neonics, as they are called, are carried through the plant's system and are fatal to a wide variety of beneficial insects, according to the suit. Two of the groups involved in the legal action were successful in stopping the use of GMO crops on refuges in the northeast and southeast. How this will affect waterfowl in the long term, scientists will have to determine.