Why Do Humans Speak So Many Languages?

People don't speak one universal language, or even a handful. Instead, today our species collectively speaks over 7,000 distinct languages.

By Associated Press and Michael Gavin, Colorado State University

The thatched roof held back the sun's rays, but it could not keep the tropical heat at bay. As everyone at the research workshop headed outside for a break, small groups splintered off to gather in the shade of coconut trees and enjoy a breeze. I wandered from group to group, joining in the discussions. Each time, I noticed that the language of the conversation would change from an indigenous language to something they knew I could understand, Bislama or English. I was amazed by the ease with which the meeting's participants switched between languages, but I was even more astonished by the number of different indigenous languages.

Thirty people had gathered for the workshop on this island in the South Pacific, and all except for me came from the island, called Makelua, in the nation of Vanuatu. They lived in 16 different communities and spoke 16 distinct languages.

In many cases, you could stand at the edge of one village and see the outskirts of the next community. Yet the residents of each village spoke completely different languages. According to recent work by my colleagues at the Max Planck Institute for the Science of Human History, this island, just 100 kilometers long and 20 kilometers wide, is home to speakers of perhaps 40 different indigenous languages. Why so many?

We could ask this same question of the entire globe. People don't speak one universal language, or even a handful. Instead, today our species collectively speaks over 7,000 distinct languages.

And these languages are not spread randomly across the planet. For example, far more languages are found in tropical regions than in the temperate zones. The tropical island of New Guinea is home to over 900 languages. Russia, 20 times larger, has 105 indigenous languages. Even within the tropics, language diversity varies widely. For example, the 250,000 people who live on Vanuatu's 80 islands speak 110 different languages, but in Bangladesh, a population 600 times greater speaks only 41 languages.
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