Britannica Sources used in this answer

How do screamers use their wing spurs during conflicts?

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mallard — Anseriform Mallard (*Anas platyrhynchos*).

Screamers are equipped with a pair of sizable, bony, forward-pointing spikes located near the bend of each wing. These structures are used by the birds to strike adversaries during conflicts. While other waterfowl may possess similar horny knobs or spurs on their wrist joints, the spurs found on screamers and the spur-winged goose are specifically utilized as weapons in aggressive encounters.12