Greater Rhea vs American Wigeon

The Greater Rhea and American Wigeon are easily distinguished by size and habitat. The Greater Rhea is a large, flightless bird resembling an ostrich, while the American Wigeon is a much smaller, duck-like waterfowl. Observing their environment and behavior will quickly clarify any confusion.

Size and habitat are the most reliable indicators: look for a large, flightless bird in open grasslands for the Greater Rhea, and a smaller, duck-like bird in wetland areas for the American Wigeon.

The Greater Rhea is significantly larger, standing over 1.5 meters tall, while the American Wigeon is a small duck, typically around 50 cm in length.

Greater Rheas are terrestrial and flightless, often seen walking or running across open grasslands. In contrast, American Wigeons are strong fliers, often seen in flocks on water bodies or grazing on land.

Greater Rheas inhabit open grasslands and savannas, while American Wigeons are found in wetlands, lakes, and ponds.

American Wigeons produce a distinct, high-pitched, three-note call reminiscent of a squeaky toy. Greater Rheas are generally silent.