Tundra Swan (Whistling Swan) or Trumpeter Swan

A magnificent, large white feather belonging to one of North America's heavy-bodied waterfowl. Adults are entirely white with black bills and feet. They are known for their massive wingspans and powerful, rhythmic flight.

Pure snowy white throughout both the vane and the rachis. There is no banding or spotting, which is characteristic of adult swans. Note: This specific specimen has an artificial 'South Carolina' stamp on the inner vane.

Tightly interlocked pennaceous barbs throughout most of the vane to provide a stiff, aerodynamic surface; plumulaceous (downy) barbs are visible only at the very base near the calamus.

Smooth, stiff, and somewhat waxy to the touch for water-resistance. The surface has a slight matte-to-satin luster typical of high-quality waterfowl feathers.

Large size, pure white color, extreme asymmetry of the vanes, and a very thick, stiff central rachis.

Large open water bodies, lakes, rivers, and coastal estuaries. During breeding, they inhabit arctic tundra or northern wetlands.

North America. Tundra Swans migrate from arctic regions to the Atlantic and Pacific coasts; Trumpeter Swans are found in the Pacific Northwest, Rockies, and Upper Midwest.

High-level herbivore in aquatic ecosystems. They are sensitive to lead poisoning from lead shot in wetlands and serve as indicators of wetland health.

Snow Goose (smaller, usually has a black tip on primaries), American White Pelican (black primaries), Great Egret (much smaller, more delicate rachis).

Swans are among the heaviest flying birds. A Trumpeter Swan can weigh over 25 pounds and has a wingspan of up to 8 feet. They often mate for life.

The feather appears to be in 'Fair' to 'Good' condition. There is significant 'zipper' separation (unlocked barbs) in the mid-section and mechanical damage/wear at the tip, plus an artificial ink stamp.