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Birds live life in the fast lane, flying, often catching insects at speed, and communicating with each other using songs that can incorporate tens of notes per second. Wildlife sound recordist Chris Watson plays the song of a small garden bird, the wren, and slows it down to demonstrate how it might sound to the birds themselves. Can they hear more notes than we can in the same amount of time? Image: Eurasian Wren (Troglodytes troglodytes) Credit: Getty Images