Martin K, Estate Manager- "She takes out the goats for grazing and brings them back. A shepherd is usually required to accompany the goats all day long and bring them back in these hills. But because of her, manpower can be spared. She is as good as a shepherd. The only thing is that she does not speak, but otherwise carries out all responsibilities."
They say they feel confident that the goats will be safe when Mani accompanies them.
Mani is said to make a strange sound when she discovers a goat is missing or when danger lurks.
There's a (non-embeddable) video of the monkey at the link.
image by flickr user eirikref used under creative commons license