In September 2021 A Russian photographer (Dmitry Kokh) captured a fascinating series of photos showing polar bears that took over the abandoned buildings of a meteorological station on an island between Russia and Alaska. The island is located in the Chukchi Sea, a marginal sea of the Arctic Ocean.
You could say the same of people.
Nah, If you sit on their head they won't be able to open their jaws and bite you.
Are you sure?
Last time I sat on someone's head their jaw was certainty able to move.