Professor Wells confirmed Green's observations, explaining: "This phenomenon is well attested in birds. You find distinct chirping accents in the same species around the country. In small populations such as herds you would encounter identifiable dialectical variations which are most affected by the immediate peer group."

https://www.theregister.com/2006/08/23/cows_have_accents/

It's the same with chickens. :)

English cows: [myː]

Australian cows: [məːʉ]

American cows: [mʊu]

All cows are female. “What’s she saying”

In the Netherlands they say boo!