It is a small wading bird that lives in moist forests in eastern North America. Belonging to the sandpiper family, it is known for its unique mating flight. With a round body shape, short legs, and a straight beak that appears particularly long in proportion to the body, it is very suitable for exploring food in soil, especially earthworms. The eyes are large and round, located at a higher position on the head, providing a broad field of view that allows for almost a 360 degree view of the surrounding environment. In spring, male American sandpipers perform special aerial courtship shows at dusk or dawn, making the sound of "pee" and flying into the air in a spiral pattern to showcase their flying skills.

Binniao is a genus of birds belonging to the sandpiper family. Coastal birds mainly inhabit aquatic environments such as wetlands, coasts, and river edges. Their body size is medium-sized, with a length of about 30-40 centimeters. The appearance features include a long and slender mouth and legs, a slender neck, and gray brown feathers. Their body size is adapted to the need for foraging in environments such as wetlands and mudflats. It is a migratory bird that migrates relatively far. They breed in warm seasons and generally choose open wetland areas for nesting and spawning. Food mainly includes insects, worms, small arthropods, seeds of aquatic plants, and plankton.