Comment by rdtsc

> Anne Ollila, chairwoman of the Reindeer Herders Association

These seem to be either domesticated or herded on certain territories by natives. So spray painting a herd may not be as hard as it sounds.

From https://reindeerherding.org/world-reindeer-herders

> The Association of World Reindeer Herders is a voluntary civil society organization for all the 24 different nomadic indigenous peoples who make a living from reindeer herding across 10 nation-states in the circumpolar north, formally founded during the 1st World Congress of Reindeer Herders in 1997.