The exact sound can vary depending on the species of heron, but the general idea is a low, raspy, and somewhat guttural sound.
What kind sound does a heron make?
Herons don't make a lot of noise. The most common sound they make is a deep, croaking call, often described as a "quawk" or "krawk." You might also hear a raspy screech or a low, guttural rumble from them.