A bird attacks his opponent during the final match of Thailand's 2015 Cock Fighting Championships.

Men place bets with hand gestures during a tense bout at Thailand's 2015 Cock Fighting Championships.

A man tapes up the spurs of his bird at Thailand's 2015 Cock Fighting Championships.

A man tapes up the spurs of his bird at Thailand's 2015 Cock Fighting Championships.

Birds' peaks are muzzled during the fights.

Two birds square off on the main stage at Thailand's 2015 Cock Fighting Championships.

A bookie writes down a bet during a fierce fight at Thailand's 2015 Cock Fighting Championships.