Tigers in India have been photographed in high-altitude mountains rarely seen before, with experts suggesting relentless human pressure and a heating climate are driving them from traditional hunting grounds.
Researchers from the Wildlife Institute of India (WII) said they were surprised to find "multiple pictures" of tigers in the mountains of Sikkim -- the Indian state squeezed between Nepal, Bhutan and Tibet -- including one snapped at 3,966 metres (13,011 feet).
