Advice/Accounts on how to befriend crows has been submitted here in the past, but there hasn't been anything regarding cows, unfortunately.
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They like licking hands and under-the-chin or cheek scritches; move slowly and talk, and if they're skeptical try crouching to make yourself smaller. (but don't make mothers suspect you're after their calves!)
Anyone know about bison?
Now that's some cultured dairy!