I was going through old images on backup Hard disks and found this image of a pair of Sandhill Cranes in flight at the Lake Woodruff NWR in Florida many years ago. Photographed with a Sigma 300-800mm f/5.6 zoom lens. The Sigmonster as it was called was an interesting lens. Very Sharp at all focal lengths but TOUGH to carry around a large Refuge at 12+ lbs and then the tripod and camera body, but you could really work an area and get some Great Images!
Below is an image of some Whooping Cranes that stayed with that flock of Sandhill Cranes at Lake Woodruff that year.
Sometimes it is fun to go through old images. Hopefully it shows your photography is getting better over time!