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Les girafes fredonnent -mais seulement la nuit
[Article] Giraffes 'hum' - but only at night
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Vienna (Article and photo AFP) - Lions roar, wolves howl and elephants trumpet. But what do giraffes do to communicate? They "hum", new research suggested last week - and only at night.Unlike other similar species, giraffes were not thought to be strong vocal communicators, producing nothing more...
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