Flora Davis
Flora Davis is also the author of Inside Intuition: What We Know About Nonverbal Communication.
Just as birds learn the song of their kind and not that of some other species, so babies learn to speak and not to bark or chirp. And just as some birds learn dialects, humans learn different languages - and, of course, local dialects of those languages. Eloquent Animals, 1978.
We now know that calls, like songs, are sometimes partly learned and can be distinctive enough for one bird to recognize another. Ibid.
Perhaps if we can somehow reach into the minds of other species, more of us will come to sense the connectedness of all life. Ibid.