Birds don't just sing for beauty, their voices carry messages, warnings, and even regional dialects that reveal a hidden ...

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 ...

If you’ve ever been out in the New Zealand wilderness, you might have heard a distinctive, low-frequency tone. It sounds less like an animal than the kick on an electronic drum machine. A look through ...