-20F at the Lamar Buffalo Ranch. Original public domain image from Flickr https://www.rawpixel.com/image/4039421/photo-image-background-nature-mountainFree Image from public domain licenseBison feeding in the snow, Yellowstone National Park. NPS Photo/David Restivo. https://www.rawpixel.com/image/4225294/photo-image-public-domain-ocean-natureFree Image from public domain licenseBison- close up in a snow storm in Lamar Valley by Neal Herbert. Original public domain image from Flickr https://www.rawpixel.com/image/4039161/photo-image-nature-iceFree Image from public domain licenseFrosty bison on a cold morning by Jacob W. Frank. Original public domain image from Flickr https://www.rawpixel.com/image/4038929/photo-image-nature-ice-landscapeFree Image from public domain license