This rooster is hidden at Verdera in Madrugada, on the east edge of Verdera. Pick it up to add another fighter to your cockfighting roster and tick off one of the 13 collectible roosters.
Look near a thatched-roof shack on the east edge of Verdera.
Walk up to the rooster and interact with it to collect it. It joins your roster straight away, so you do not need to carry it anywhere.
Acero joins your roster as a fighter you can pick for cockfights at Montero Farm. Winning your first match there unlocks Top of the Pecking Order.
Rooster: Elvis Carballo
This Madrugada rooster comes from Elvis Carballo at Montero Farm rather than from a hiding spot. Earn it to add another fighter to your cockfighting roster and tick off one of the 13 roosters.
Rooster: Montero Farm arena
This rooster is hidden at the Montero Farm arena in Madrugada, in the Mogote Foothills. Pick it up to add another fighter to your cockfighting roster and tick off one of the 13 collectible roosters.
Rooster: Serpentino Park
This rooster is hidden at Serpentino Park in Madrugada, near the Cortina River. Pick it up to add another fighter to your cockfighting roster and tick off one of the 13 collectible roosters.
Rooster: Álvarez Farm
This rooster is hidden at Álvarez Farm in El Este, on the Vacía Coast. Pick it up to add another fighter to your cockfighting roster and tick off one of the 13 collectible roosters.