@birdsandbats It could very well be. I compared all the tern species that travel to the Maryland area, and this was the only one that I found that matched. But I could be wrong as well.
@CheeseChameleon2007 All of the field guides I own show Roseate Terns as having entirely black bills, but just looking at some photos on the internet this is obviously not true. Why is this? Are my field guides lying?!
I would say that the legs aren't the right color for a Roseate, either, but maybe that's wrong, too! I'm so confused!
EDIT: Apparently Roseate Terns don't breed in Maryland, so I think we can rule them out either way.
@birdsandbats Alright, we shall rule them out. Tern color variations are pretty variable, and can be confusing and unique to any bird, so that's why some terns look different than the others. But this also could be a female, and the female of any tern can look drastically different from the male. Heck, I could even say this may be a growing juvenile for all I know? I have field guide of shorebirds as well, but I cannot find it, and have not seen it for some time now.