Question

why do cows has bells​

Answer 1

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A cowbell (or cow bell) is a bell worn around the neck of free-roaming livestock so herders can keep track of an animal via the sound of the bell when the animal is grazing out of view in hilly landscapes or vast plains.

Answer 2

In alpine regions, cows are often equipped with a bell throughout the summer season to ensure that farmers can locate their animals on the wide alpine pastures, many areas that are obstructed from view.