Survival International has campaigned for the rights of reindeer herding tribes for decades.
In this seasonal gallery, Survival reveals extraordinary facts about the reindeer.
'We were made the same as the sand'
'The ocean is our universe'
'We learn with the great spirits'
Nine facts for 9 August: UN Indigenous Day
'We are here for our children'
Guardians of the world's rainforests
'Our souls touch': Sámi reindeer herders
The Nenets of Siberia
'Today we are crying with happiness'
Voices from the Lower Omo Valley
Fishermen of Amazonia
Nitassinan: walking in the footsteps of Innu ancestors
We are inside it, and it is inside us
Peru's uncontacted tribes threatened by gas project
Tribes from the Air
We didn't know about sugar in the blood
Celebrities supporting the Awá
Ingenious skills of tribal peoples
Refugees in our own country
Universal Children's Day
2013: A year of successes
The Awá: Sebastião Salgado's gallery
Faces of Genocide
"We, the People" 2015 Calendar