The cockerel was found during excavation work at the former Bridges Garage site on Tetbury Road in Cirencester - once the second largest town in Roman Britain.
The police assisted the RSPCA with a three-day operation in January 2012 and removed 29 dogs, 13 horses and a number of chickens, goats, cats, ducks and a cockerel from the rescue centre, where the family lives.