[1/5]Sami reindeer herder Nils Mathis Sara, 65, monitors his reindeer with binoculars during supplementary feeding near Geadgebarjavri, up on the Finnmark plateau, Norway, March 13, 2024.

Reindeer are big animals that need a lot of energy, but their diet consists mostly of organisms called lichens – also known as reindeer moss. "Lichens are this amazing lifeform.