These distant pictures were taken in Laguna Bávaro lagoon last week.
Pic 1 seems like a Least Tern?
Pic 2 ,3, and 4 are likely the same tern (not 100% sure, though) but I don't know what they might be.
Do you agree this is a EF rather than a peregrine? It seems to be so, but I'm not sure that the distinctive darkness in underwing-coverts is real or it might be caused by shade.
Eleanora Falcons do occur in the area.
Thank you in advance!