It's the turn of different new Terns to my collection! This is a Sandwich Tern and seeing this had me running for my 'Birds of Oman' book. I don't know if you can see it, but this bird(in Summer Plumage) has a black beak with just a small yellow tip. The black cap is usually just a slight amount of scattered grey feathers. This bird is a passage migrant and happy to mix with the Caspian and Lesser Crested Terns that are flocking on Oman's beaches, although this one was flying over my wadi.