For the past several weeks, waterfowl biologists have been combing Tule Lake National Wildlife Refuge to take stock of the ducks currently molting on its only remaining wetland unit. Long after the sun has set, staff from the U.S. Fish and Wildlife Service and the California Waterfowl Association don warm clothes and waders and zip across the shallow water on airboats, catching ducks and bringing them to shore to be banded. Tag along with the biologists as they continue their work during an exceptionally challenging year.