Voice is sound made by the vocal organs of people and some animals. Ideas and feelings can be communicated from one being to another by means of the voice. For example, the voice of a chattering robin warns other birds to stay away from the nest. The voice of a barking dog may indicate that a stranger is near. The voice of a crying baby may indicate hunger or sickness. As human babies grow, they learn to use the voice to speak.
No two voices are exactly the same, so the sound of the voice identifies the speaker. Males usually have deeper voices than females. They have longer vocal cords. The singing voice expresses a wider range than the speaking voice. Some voices are uninteresting because they do not vary in tone. This evenness of pitch is known as monotone.
