This is Scientific American's 60-second Science, I'm Christopher Intagliata.Tracking wildlife is a tough job. Take the case of a one-eared leopard named Pavarotti.For this guy: "He was a very big beautiful male, and he had a very, very deep, deep roar, and so they named him after Pavarotti."Kasim Rafiq, a wildlife biologist at Liverpool John Moores University."So I used to get up at the crack of dawn, follow his tracks and try and find him.So one day, I went out, and I was looking for him.And his tracks took me off road through this woodland area....and..."Before he knew it, the wheel of his Land Rover was stuck in a warthog burrow.He wasted several hours getting it out.And then, on the way back to camp, he bumped into some local tour guides and their safari guests,who'd had way better luck spotting Pavarotti."Basically, they laughed and they talked to me that they'd seen him that morning."Rafiq then realized that tourist wildlife sightings might be an untapped source of information about wild animals.So he and his team worked with a safari lodge in Botswana to analyze 25,000 tourist photographs of wildlife.They used those as sightings of lions, spotted hyenas, leopards, cheetahs and wild dogs.They then compared those data to the estimates they made with traditional wildlife biology tactics:stuff like camera traps, track surveys, and "call-in stations" ―where they play sounds of distressed animals in the middle of the night and see who pops by.It turned out that the estimates from tourist photos were just as good as those gleaned from traditional methods.