Two American kestrels perched in an aspen tree by Jacob W. Frank. Original public domain image from Flickr https://www.rawpixel.com/image/4038374/photo-image-bird-animalFree Image from public domain licenseCrested Pool in Upper Geyser Basin by Jim Peaco. Original public domain image from Flickr https://www.rawpixel.com/image/4039105/photo-image-nature-mountain-waterFree Image from public domain licenseMannoth [sic] Hot Springs, Yellowstone National Park. by Benjamin West Kilburn https://www.rawpixel.com/image/14294676/mannoth-sic-hot-springs-yellowstone-national-park-benjamin-west-kilburnFree Image from public domain licenseMorning preparations and repairs near West Thumb by Jacob W. Frank. Original public domain image from Flickr https://www.rawpixel.com/image/4226004/photo-image-public-domain-person-landscapeFree Image from public domain licenseSparrow fledgeling in a sagebrush by Jacob W. Frank. Original public domain image from Flickr https://www.rawpixel.com/image/4038330/photo-image-tree-plant-babyFree Image from public domain licenseFledged great horned owl chick walking out on a limb by Jacob W. Frank. Original public domain image from Flickr https://www.rawpixel.com/image/4038042/photo-image-bird-animalFree Image from public domain licenseSwan on the Madison RiverTrumpeter swan on the Madison River by Neal Herbert. Original public domain image from Flickr https://www.rawpixel.com/image/4039192/photo-image-bird-nature-waterFree Image from public domain license