Our world is such a big place, we sometimes forget how different people can be across this beautiful planet.
While we drive to work, talk to each other on our cell phones, and surf the internet, there are cultures that still live much like they did hundreds of years ago.
The Dukha people of Mongolia are one of those cultures.
Also known as the Tsaatan, or "reindeer herders," the Dukha live along Mongolia's Russian border.
For generations, the tribe lived as wandering nomads, using domesticated reindeer for transportation and hunting animals like moose and deer to feed themselves.
Now, there are less than 300 Dukha living in just over 40 families, and their way of life is slowly changing with the times.
Photographer and researcher Hamid Sardar captured a rare, close-up glimpse of life among the reindeer herders.
Sardar explains that the Dukha have a deep, spiritual relationship with the reindeer they herd.
"The deer is a totem and each person in the tribe is connected to one spirit deer which protects that person, absorbing all disease," he told The Independent.
"The Dukha do not have enough reindeer to use them for meat, so the only time they eat deer is when the spirit deer dies”
But as the Dukha's reindeer herd shrinks, their way of life is changing quickly.