Ravens are intelligent birds, able to issue a large and diverse voice calls, including those issued by the throat quack sound, voice chattered and the sharp metallic sound.

• 乌鸦是很聪明的鸟类，能发出大量不同的语音呼叫，包括喉咙发出的嘎嘎声，声音喋喋不休和尖锐金属声。