Fantasy about birdmen, an isolated group of men who could mentally connect with birds. Probably published in the 1970s.

[summershots]

A group of men in this fantasy could mentally connect with birds. The group isolated themselves and thought differently than humans.

[Kris]

summershots, I moved your request to the "Unsolved" folder because you're looking for one specific book.

Is this book for adults or teens?
Did you read it in the 1970s?

What's the location?