Which terns are these? South Padre Island flats, Texas, USA (1 Viewer)

[River Girl]

I know the bird on the left is a Royal, but not sure about the center bird with black edges on wing, and bird on right either Forster's or Sandwich? Thank you

 

[aeshna5]

Think other than the Royal Tern they are Cabot's (split from Sandwich by some authorities).

 

[Southern Viking]

One in the middle is a Least surely?

 

[THE_FERN]

I think (left to right): royal, Cabot's, least, Cabot's. Cabot's over forster's really due to leg colour. I would expect to be able to see a yellow tip to the bill of the rightmost bird: surprised I can't

 

[Ruff-Leg]

Rivergirl, if you have any North American bird guides, book or app, Cabot's will be referred to as Sandwich. As aeshna5 mentioned, that may change here in NA in the future.

 

[River Girl]

I think (left to right): royal, Cabot's, least, Cabot's. Cabot's over forster's really due to leg colour. I would expect to be able to see a yellow tip to the bill of the rightmost bird: surprised I can't

I agree. I always look for the yellow tip, and there were other terns in a group that did have it. This is the first I have heard of "Cabot's" terns.
I did not recognize the Least and I usually do. Thank you.