Tribalism is an innate part of human nature, X-Men star Michael Fassbender has said.
In his latest film, the Irish actor plays Chad Cutler in Trespass Against Us, which follows a small community of Irish travellers living in the West Country.
Arriving at the BFI London Film Festival premiere of the new film, Michael told the Press Association: "History teaches us that we seem to be a tribal breed."
He added: "Human beings are just kind of like that, whether it's football teams you support or borders that you cross or are behind, it just seems to be in our nature."
Michael revealed his motivation for starring in the film was to "to provoke conversation" about tribalism and, more specifically, the relationship between the Irish travelling community and the settled community.
He said: "I wanted to do it because I loved the script. I was totally enchanted by the story and the script was sort of like a slap in the face. It didn't seem like a regular format, its narrative.
"Both these communities have been living alongside each other for centuries, and still at times they are at odds with one another.
"We felt like that was something worth talking about or at least exploring and perhaps provoking dialogue."
Earlier this month, the Shame star was awarded his hometown's greatest honour as he was inducted into the Order of Innisfallen - bestowed by Killarney in County Kerry - in recognition of his remarkable achievements in the film industry.
He called the event a "special honour" and a "delight".