Hunting may be the best way to consume animal products.
From the Atlantic, here's a firsthand account of drinking deer milk straight from the udder of a freshly killed doe. This article is not for the deer lovers of the world:
It was nearly dark on the last day of my hunt, and I had just shot two does, a mom and her fawn, standing near each other. Mom heard the first gunshot but didn't know where it came from. As she looked toward her fawn, I shot her. After dating my last two doe licenses, I prepared to get to work.
I was more than a mile from my car, and the only way to take out two deer at once is to leave behind everything but the meat. This procedure takes time, and as the setting sun sent the temperature plummeting toward zero, I realized I couldn't find my headlamp. I'd be butchering in the dark. This can be especially treacherous when it's so cold you might not feel knife on hand. Luckily, the heat of the animals kept me warm.