Tadorne à tête grise vs Oie-armée de Gambie

The Spur-winged Goose is significantly larger than the South African Shelduck and has a distinctive spur on its wings. The South African Shelduck is more compact and lacks the spur, with a more uniform coloration compared to the Spur-winged Goose's contrasting black and white plumage.

Look for the size difference first; the Spur-winged Goose is much larger. Check for the presence of a spur on the wings of the Spur-winged Goose. Observe the plumage: the Spur-winged Goose has contrasting black and white colors, while the South African Shelduck has a more uniform appearance.

The Spur-winged Goose is much larger than the South African Shelduck.

The Spur-winged Goose has a striking black and white plumage, whereas the South African Shelduck has a more uniform coloration without the strong black and white contrast.