interesting fact: the grizzled leaf monkeys at howletts came from perth zoo - who no longer wanted them.
I think it was the original pair of purple faced langurs that Edinburgh zoo had were the langurs in question.
Both the grizzled and banded langurs came from Ragunan zoo in Indonesia.
And here is my question, are the Panay cloudrunners at London the only ones of their kind outside of the Philippines ?