Both are a risk to life and limb on the roads. Be careful out there...
The elk stayed a good distance from the road. On the other hand, we had to stop more than once for buffalo on the road. They look at you when you drive slowly by, as if daring you to do anything to get them off the road. You do have to be careful when driving in Yellowstone, as the animals do go onto the road fairly often.
Both are a risk to life and limb on the roads. Be careful out there...
That's why you should use the picinic tables to eat your buffalo and elk.