Seems like the rules for going in and out of Canada change all the time. I've been many times. One year it was no firewood in. Another it was no potatoes in. Another it was no reptile skin of any kind in. One year it was no deer meat out. Another it was just no bones out. Another, no skull or spine out. A few years ago, you could bring back the whole deer. Guts and all. Weird.
You can still get through with one but you'd better have your t's crossed and i's dotted before you get to the border. Seen a poor kid from Washington, GA get turned around at International Falls and his 3 buddies got through. 24 hour drive back home solo.