Colusa National Wildlife Refuge - Ducks, geese and other waterfowl and shorebirds are concentrated in small areas in the Sacramento Valley, a product of drought conditions and annual pre-winter conditions.  Bird counts: 431 sandhill cranes, 1,908 coots, 24,698 white-fronted geese, 482 ring-necked ducks, 47,047 ducks, which includes 3,009 mallards, 24,396 pintails, 4,079 gadwalls, 2,132 wigeon, 5,877 green-winged teal, 7,912 shoveler, 2 wood ducks.