Perhaps I'm oversimplifying things here, but if cables are getting chewed on, and chemical deterents cannot be used (because nobody in India wants to hurt a monkey) why not just run the cables through metal conduit? The monkeys won't try to chew through THAT.
http://www.electronicproducts.com/Multimedia/Telecom/Animals_vs_Technology_India_s_18bn_IT_plan_in_question_as_monkeys_won_t_stop_feasting_on_country_s_data_cables.aspx
(I also appologize if this is the wrong forum, but 'citywide IT' seems more like a Civil Engineering issue than a Networking issue, both from the scale and from the obstacles encountered.)
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