Nature puts every chirp in its proper place. Avian sounds—flutish trills, alarmlike buzzes, and one-note squawks alike—are immediately absorbed, reflected, and scattered by everything in a bird’s habitat. Nearby leaves or branches, canyon walls, and even the wind influence notes, so over time, species tailor songs to suit those surroundings. Some minimize echoes by putting more space between notes, while others use low frequencies that travel farther. Here’s how some birds have tweaked their waveforms.