The refuge provides the sanctuary areas necessary to protect wintering mallard ducks and, to a smaller extent, lesser and Columbia Basin Canada geese. In addition, many other species of wildlife are year-round residents or use the refuge during various seasons.
The ledges, cracks and holes which abound in the many basalt cliffs provide important nesting grounds for red-tailed hawks, American kestrels, owls and a few ravens. Great blue herons are frequently sent in increasing numbers of sandhill cranes visit the refuge. Coyotes are relatively abundant but are secretive and not often seen by visitors. Five species of snakes are found on the refuge, including the western rattlesnake.
The refuge provides the sanctuary areas necessary to protect wintering mallard ducks and, to a smaller extent, lesser and Columbia Basin Canada geese. In addition, many other species of wildlife are year-round residents or use the refuge during various seasons.