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The Knob-billed Duck and the Red-headed Weaver are easily distinguished by their size and habitat preferences. The Knob-billed Duck is a large waterfowl with a distinctive knob on its bill, while the Red-headed Weaver is a small, vibrant bird found in wooded areas.

Look for the knob on the bill of the Knob-billed Duck and its larger size. The Red-headed Weaver's bright red head and smaller size are key identifiers.

The Knob-billed Duck is significantly larger than the Red-headed Weaver, being a large waterfowl compared to the small, passerine weaver.

The Knob-billed Duck has a predominantly white body with dark wings and a unique knob on its bill, whereas the Red-headed Weaver is noted for its vibrant red head and contrasting plumage.

The Knob-billed Duck is typically found in wetland areas, while the Red-headed Weaver inhabits broadleaf woodlands and savannas.