These Caspian Terns in Kuwait (29.31722, 47.87222) are in what reminds me of post-breeding habitat in Mexico's western coast. The photo is fascinating to me because it shows 7 adults in breeding plumage and then the tern second from the left is a young of the year. The tern to its right also appears to be a youngster, but could be an adult moulting into non-breeding plumage. I would guess these birds bred in eastern Africa between November and February before migrating north, but it is only a guess. The Far eastern curlews are probably heading north to breed, so it is a very interesting mix of birds indeed.