Example spectrograms showing the electric moped sounds and the imitations produced by Chinese Blackbirds. (A)–(B) Three examples of locking sound, unlocking sound, and alarms from three brands of ...

An example of a spectrogram, which scientists use to highlight sound sources based on their visual signatures. Credit must be given to the creator. Only noncommercial uses of the work are permitted.

Warning: This graphic requires JavaScript. Please enable JavaScript for the best experience. By Bishop Sand March 20 at 8:00 a.m. Listen to a dawn chorus from ...