Blackwater NWR has some amazing sunsets. I was told it is because it is close to the coast of Maryland. This post again is from a trip here a few years ago which I found on some of my external drives.
At sunset flocks of birds fly out into the colorful sunset. Sometimes they could be Swans, Red-winged Blackbirds, Canada Geese, etc. The featured panorama is a 5 image panorama of the sunset with Canada Geese flying off.
You can also see Bald Eagles, one or a few flying off in the evening sky.
The images below are single shots of birds flying by into the sunset after I shot the panorama.