Page last updated at 10:32 GMT, Tuesday, 12 May 2009 11:32 UK

Giggle of a dominant female hyena


Researchers at the University of California, Berkeley have discovered the social information encoded in the laughing sounds hyenas make as they compete for food.

Younger hyenas had higher-pitched giggles, and subordinate females had more variable bouts of giggles, with a wider variety of sounds.

By contrast, dominant females - the clans' leaders - had less variable vocalisations.

Here, the dominant female Kadogo demonstrates a lower-pitched and less widely-varying bout of giggles than other clan members.

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