By A Mystery Man Writer
Cow bells are a popular cliche of the Swiss Alps, but do they harm the cows?
Livestock - Wikipedia
Why do Swiss Cows wear bells?
Frontiers Regular Exposure to Cowbells Affects the Behavioral Reactivity to a Noise Stimulus in Dairy Cows
3M Cattle Company
Why Swiss cows wear bells - HubPages
Cattle - Wikipedia
Cow bells and their effect on cow behaviour - Dairy Global
Agriculture, Free Full-Text
Why do cattle wear bells? - Quora