Emu

, the Powerful-Voiced Flightless Birds The most impressive characteristic of emus is their vocal ability. In addition to grunting, belching, and growling sounds, they can also produce a resonant drumming sound that can be heard up to 2 km away. These sounds are produced in the throat. There, the trachea connects to the neck air sacs, which act as resonance chambers. The air sacs are otherwise used for breathing, pumping air through the lungs like a bellows.

Did you know?

The second-largest birds on Earth, after the ostrich, have wings that are only 20 cm long.