For those of you have never been birding with a pro, it's all done by ear. They listen first, then locate by ear,
then look for the bird. Some can identify birds, by sound, for several different continents. Also, they will
burst out laughing when a movie sound track has birds from the wrong location. I can recognize some birds,
but always feel uneducated when I hear many I don't know, in the morning through the screen.