Pato Crestudo Afroasiático vs Gansito Asiático

The Knob-billed Duck is easily distinguished by its large size and the prominent knob on the male's bill, whereas the Cotton Pygmy-Goose is much smaller and lacks any bill knob. These species differ significantly in size and bill structure, making them distinguishable even at a distance.

Look for the large size and knob on the male's bill in the Knob-billed Duck. The Cotton Pygmy-Goose is much smaller and lacks any bill knob, often seen in large flocks.

The Knob-billed Duck is significantly larger than the Cotton Pygmy-Goose.

The Cotton Pygmy-Goose is more social, often forming large flocks, while the Knob-billed Duck is typically seen in smaller groups.

The Cotton Pygmy-Goose prefers wetlands with abundant floating vegetation, while the Knob-billed Duck is more adaptable to various wetland habitats.