Where have the tigers of Sariska gone? The last official count was last summer when there were at least 15 tigers in this 866-sq-km reserve in Rajasthan—the previous Census had put it at 24—but for six months now, except for two sightings by tourists, not one tiger has been seen, not one pug mark by any official. Experts are so worried that Project Tiger director Rajesh Gopal says he has asked for a report from Sariska authorities. ‘‘It’s unnatural if no pug mark is found. Natural death cannot happen at that scale. I will visit Sariska soon.’’ His alarm isn’t misplaced. Consider these: • Traditionally, tigers retreat to the hills due to abundance of water during July-August rains before returning to the plains by October. And the ‘‘peak’’ season for tiger-sightings is December-January. But no forest official has spotted a tiger since June last year. • Says Deputy Field Director Priyo Ranjan, who took charge last September: ‘‘I am yet to see a tiger here.’’ • In the peak season in 2003-2004, there were 17 official sightings, the previous year there were nine. • No tiger pug mark or kill has been traced since the last monsoon. In the peak season,pugmarks are seen, on an average, every day. • No tiger carcass recovered to suggest natural death. • Leopards are seen frequenting the tiger territory like never before. • Forest officials rule out an epidemic and deny having any evidence of tiger poaching. ‘It’s a mystery’