that's why biologist hana raza and her colleague koresh ararat like to get an early start.hey're looking for traces of the biggest predator here, a leopard that's considered the top of the food chain. reporter: the persian leopard is virtually invisible. people who live here in the mountains of qara dagh know of the leopard, but very few have ever seen it. even hana raza, who's been working and doing research here for years now, has never encountered a leopard in the wild. that's why they use camera traps. hana: so, this is the wild goat. we get a lot of pictures of them on our camera traps, which is a good indicator of the prey available for the persian leopard. this is one of the r reasons wy different mammal species, and also a lot of birds. we have the wild goat, we have the greyey wolf, jackal, fox,, wildcats, the asasiatic wildcats well. rereporter: the leopards have o compete with wolves for their prey, and occasionally other leopards. but persian leopards have become very rare in these mountains. hana: so this leopard is the the persian leopard in 2011. thisis one i