Hello Whatbird,
I am having difficulty with this tern. It was among a group of Caspian. It is the tern in front facing to the right with orange bill. It is different than the Caspians in the group. I have had a few people say it was a possible juvenile Caspian and others have said Royal. There was at least one Royal seen in the area, Bombay Hook NWR, Kent County, DE 8/17/2019
Thank you,
Nancy Erickson