Knob-billed Duck vs Garganey

In short

The Knob-billed Duck is easily distinguished by its large size and distinctive knob on the bill, while the Garganey is a smaller duck with a more streamlined appearance and lacks any knob. These two species differ significantly in size and structure, making them straightforward to tell apart in the field.

Identification tips

• Look for the large size and distinctive knob on the bill of the Knob-billed Duck.
• Note the smaller size and lack of a knob on the Garganey.
• Observe the contrasting black and white plumage of the Knob-billed Duck versus the more muted tones of the Garganey.

Size

The Knob-billed Duck is significantly larger than the Garganey.

Plumage

The Knob-billed Duck has a striking black and white plumage with a glossy greenish-black head and neck, whereas the Garganey has a more subdued brown and gray plumage with a distinctive white supercilium.

Habitat

Knob-billed Ducks are often found in larger bodies of water and open wetlands, while Garganeys prefer smaller, more vegetated wetlands.