Caspian Gull and Red-necked Grebe

While in work during the week, I received a text to say the Caspian Gull was spotted back in Tallaght so with that knowledge, and knowing the Red-necked Grebe was giving good views, my mind was made up to head out Saturday morning to get these birds. The Caspian Gull was a life and Irish tick for me and when I got to Sean Walsh park in Tallaght this morning, it took a bit of searching but I located the bird on the roof of a house. However, the bird proved flighty as it was being harassed by a Lesser Black Back Gull. I did manage a few shots which I have attached below.
After that, we headed for Dun Laoghaire and the Red-necked Grebe, which I located in the harbour by the east pier. The bird gave good but distant views and was constantly on the move. The bird was coming into summer plumage, which I have not previously seen, and to have the views I had was a joy. Also in the harbour, were plenty of Great Northern Divers. This is a bird which is normally off the south, west and north west coasts of Ireland, so to see them in high numbers off the east coast is unusual.