Book 31, Question 85
How can a bird sing a trill too quick for us to hear?
Many songbirds sing so quickly that we can’t hear all the notes.
Their syrinx muscles can change position again and again in a split second. When scientists slow a recording down, the song turns into many separate notes and the pattern appears. Birds can hear those fast details, and we can’t. That’s why a single trill may carry a lot of information.