The Vesper Sparrow is also known as a Bay-winged Bunting in Yellowstone Park.
The Horned Lark feeds in the grass.
The Vesper Sparrow is also known as a Bay-winged Bunting in Yellowstone Park.
The male Mountain Blue Bird is visible in the grass.
The bird is feeding in the weftlands grasses in Yellowstone.
See photo in original gallery.