Knob-billed Duck vs Eurasian Nightjar

The Knob-billed Duck and the Eurasian Nightjar are vastly different in appearance and behavior, making them unlikely to be confused in the field. The Knob-billed Duck is a large waterfowl with a distinctive knob on its bill, while the Eurasian Nightjar is a cryptically plumaged nocturnal bird. Their habitats and behaviors are also distinct, with the duck found near water and the nightjar active at dusk and night.

Look for the knob on the bill of the male Knob-billed Duck and its presence near water bodies. For the Eurasian Nightjar, note the cryptic plumage and listen for its churring song at dusk. The nightjar's white patches in the wings and tail are visible in flight, particularly in males.

The Knob-billed Duck is significantly larger than the Eurasian Nightjar.

The Knob-billed Duck has a glossy black and white plumage with a prominent knob on the male's bill. In contrast, the Eurasian Nightjar has cryptic, mottled brown plumage that provides excellent camouflage against the ground.

The Knob-billed Duck is often seen swimming or dabbling in water, while the Eurasian Nightjar is primarily active at dusk and night, often seen flying low to catch insects.

The Knob-billed Duck is found in wetlands, lakes, and rivers, whereas the Eurasian Nightjar prefers open woodlands, heathlands, and scrub areas.

The Knob-billed Duck is generally quiet, while the Eurasian Nightjar is known for its distinctive churring song at dusk.