In Brazil, a prison replaced guard dogs with geese. These geese live between the inner fence and the outer wall. Naturally territorial and highly protective, when a prisoner tries to escape into this green area, the geese alert the guards with their horn-like calls. This trait was also used by the Romans to detect secret attacks. Additionally, geese have many advantages over dogs: they are cheaper to maintain, they have excellent night vision, and unlike dogs, they cannot be bribed with food. Geese are too aggressive to be swayed by food.
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