Researchers believe a monkey at Colchester Zoo has developed a sign language unique to her family.
Since Millie began signing earlier this year, six young males in the group have followed her example.
For the original video footage see: http://www.bbc.co.uk/news/uk-england-essex-14423989
Since Millie began signing earlier this year, six young males in the group have followed her example.
For the original video footage see: http://www.bbc.co.uk/news/uk-england-essex-14423989
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