Spurs, the bony projections found on the legs of male chickens, serve as both weapons and status symbols. These structures are primarily composed of bone with a keratin sheath covering, and they grow from the metatarsal bone. The development of these appendages is linked to hormonal changes associated with maturity.
The presence and size of these leg features influence the social hierarchy within a flock. Larger, sharper projections can aid in defense against predators and competition for mates. Historically, these have been significant in cockfighting, where their sharpness and length directly correlate to a roosters fighting prowess.