There are a total of 19 Roosters to collect in Far Cry 6, 13 of which can be found while exploring Yara. They are all located inside the wooden crates marked with the rooster icon. Two of them are related to Yara stories. The additional 6 roosters are Ubisoft Connect rewards.
The roosters can be used to have a cock fight at the ring in Montero Farm. When you collect all 13 roosters that can be found by exploring the game world, you will unlock the "Recrooster" achievement / trophy.
