In 2013, Jakarta's governor moved to outlaw the use of dancing monkeys on the city’s streets.

The Indonesian tradition saw macaques made to perform for passers-by - often restrained by chains and dressed in plastic masks. Campaigners said the animals were frequently subjected to harsh treatment and poor living conditions.

Animal rights activist Femke den Haas played a key role in securing the ban.

She tells Vicky Farncombe that it was the suffering of one particular monkey, Johnny, that spurred her to take action.

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(Photo: A dancing monkey in Jakarta. Credit: Getty Images)