Abstract:
   Pygoscelis adeliae is a dominant species of penguins in Antarctic. In the paper,  the acoustic behavior and sound signals of the Pygoscelis adeliae are studied. The pulse width of the juvenile penguin is 2.2~14.2 ms and mainly concentrates on 2~5 ms. The pulse interval is 0.2~1.1 ms and mainly concentrates on 0.7 ms. The pulse frequency is 629~4 294 Hz; and mainly concentrates on 3~4 kHz.  When the juvenile penguin looks food, the pulse width is 24.9~40.8 ms; the pulse interval is 0.2~35.9 ms; the pulse frequency is 262~4 636 Hz; and the spectrum energy in this frequency concentrates on 3~3.5 kHz.  When they come back nest, the penguin sound call signals, the pulse width mainly concentrates on 5~9 ms; the pulse interval is changeable from 1.9 ms to 36 ms; the pulse frequcency is 253~4 758 Hz, and mainly concentrates on 1 kHz.  When two penguins live together, they sound call signals that is mixed. The pulse frequency is 741~2 342 Hz, the spectrum energy in this frequency concentrates on 1~2 kHz. When two penguins live together, they sound signals and dance each other at the same time.