Who says only humans and roosters dance the cueca?
Happy Birthday Chile! The 18th and 19th of September are the Fiestas Patrias - a festival commemorating the formation of Chile as an independent state in 1818.
One eats empanadas, attends asados (BBQs), and dances the cueca, Chile's national dance.
(If you're interested, metafilter has quite a comprehensive post on the cueca today!)