You know, I'm 52 years old and I don't think I've ever seen an up-close picture of yak that gave a good sense of scale. Those things are just cold-weather banthas.
I wish I could find the video where I first saw a gaur. He's just strolling down the road of this town, and everyone is clearing the streets. It was kind of awe inspiring.
I had a similar realization about bison recently too, those things are goddamned huge, bigger even than that mid-sized SUV. Apparently they can get up to 3000lbs in weight.