Build a Bat House Painting

Done on a sunny afternoon - watercolour and acrylic on paper. Production of ultrasonic waves Most microbats generate ultrasound with their larynx and emit the sound through their nose or mouth. Sound productions are generated from the vocal folds in mammals due to the elastic membranes that compose these folds. Vocalization requires these elastic membranes because they act as a source to transform airflow into acoustic pressure waves. Energy is supplied to the elastic membranes from the lungs, and results in the production of sound. The larynx houses the vocal cords and forms the passageway for the expiratory air that will produce sound. Microbat calls (help·info) range in frequency from 14,000 to over 100,000 hertz, well beyond the range of the human ear (typical human hearing range is considered to be from 20 to 20,000 Hz). The emitted vocalizations form a broad beam of sound used to probe the environment, as well as communicate with other bats. source: Wikipedia