We stayed in Estes Park, Colorado for a few days while making our way back to Wyoming from Florida in June 2018. Our visit to Rocky Mountain National Park was memorable enough that we both left with a desire to return.
One of the treats that we experienced was watching hummingbirds dart about around the Fall River. I was able to photograph a few of the hummingbirds in flight. (Another treat was watching the elk come drink from the cold, clear water in the river.)