Tuning into the Masters, viewers not only see a lot but they hear a lot, as well. One common sound is the chirping of the birds at Augusta National. But are those birds real? CBS golf analyst Mark ...

Birds don't just sing for beauty, their voices carry messages, warnings, and even regional dialects that reveal a hidden world of communication. Bird sounds offer insight into how intelligent and ...

Part 1. 'I don't do calls' -- Crossing the sound barrier -- Tone and timpre -- Pitch and frequency -- Rhythm and timing -- Part 2. Put it all together and what have you got? -- Simple calls -- Simple ...