Big White Birds Flock Together: Swans and Snow Geese Visit the Skagit Valley Professional Review and Guide
"You may hear them before you see them, squawking, cackling, honking, chattering. When you do see them—flocks of swans and snow geese feeding in the fields and wetlands of the Skagit Valley or flying overhead—you’ll be glad you came. Begin looking in the fields as you drive along the highway, then visit the wildlife areas mentioned in the eTrail.
When you see white birds on the ground here in the winter, they are one or more of three species—gulls, snow geese, or swans. Of course it’s pretty easy to tell if the birds are gulls by their smaller size. Snow geese are all white, except for black wing tips that are most visible when they fly. The birds have a 3-foot wing span and weigh about six pounds; bills and feet are pink. Swans are much larger than geese and have longer necks."