That'd make for a great element in a modern remake of the movie, The Birds.

Researchers trying to reduce the distortion are tracking the patterns. They can't figure it out until a main character, a blind audiologist who lost his vision in the first attack many decades ago, has an epiphany and suggests assembling the images in sequence to form a video. It shows a bird flying and flapping its wings. The researchers keep gathering data, making the video longer and more complex.The bird now also does loops and spins. The researchers set up remote microphones all over the world and network them with their computer so it can compile in real time.

We learn that blind main character has now trained himself to "see" the images that he hears. Main character and love interest colleague walk through the park discussing their work as a flimsy pretext to spend time together. All of a sudden, the birdsong changes. "Run, love interest!" says main character, but love interest won't leave main character behind. The camera pans over to the computer screen in their laboratory, which overlooks the park. The video now shows another scene at the end, an enormous eagle shredding a person with its talons and beak.

That's all I've got so far.

OOooh, what if we are spectrographing bird calls and suddenly we see a picture develop out of it. Or, you could use birds to store data and no one would ever know, like a spy thing.