When a pair of tiger cubs are relocated to the Sariska Tiger Reserve in the coming days, wildlife experts won't leave them at the mercy of marauding poachers who wiped out big cats from the sanctuary in Rajasthan by 1993. The cubs, to be shifted from the Ranthambore Tiger Reserve, will be fitted with radio collars and constantly monitored by a satellite. The collars, each costing Rs 8 lakh, have been procured from a Canada-based firm, Lotek, sources said.