Sometimes also known as mak tak or muk tak. Whatever you decide to call it, muk tuk is a traditional dish in the far north of Canada. Eaten most often by the indigenous Inuit of the Northwest Territories or Nunavut provinces, it is the skin of the Beluga whale, which is boiled for about two hours, or eaten raw. In addition to caribou and fish, it is a main staple of the traditional Inuit diet.
Sources in the area report that lately, many people who eat muk tuk have been getting ill, and that PCB build-ups in the Belugas are to blame. I haven't seen any official reports that this is true, however.